The concert had been originally scheduled for October 11 but was "postponed" at the time because of what was cited as "migraine-associated vertigo." However, that concert will no longer be rescheduled.
Ticket holders can obtain refunds at the point of purchase.
There are six other postponed concerts in Montreal, Boston, Philadelphia, Greensboro, Ft. Lauderdale and Verona that are waiting to be rescheduled. It is unknown at this point whether all of those concerts will be canceled as well.
Billboard.com now has an article with statements from Janet's manager and from a spokesperson for the Palace of Auburn Hills explaining why the "Discipline" segment was cut from last night's concert in Michigan:
The singer trimmed a three-song section of her Rock Witchu Tour show, including the sexually explicit "Discipline," in order to comply with a Michigan state law prohibiting simulated sex acts in a public performing space.
Palace officials approached Jackson's camp with concerns about the segment Tuesday afternoon. An arena spokesman says that "we explained the law, asked her not to do it, she complied. We did not ask her to cut the song. That was her call."
In a statement, Jackson's manager Kenneth Crear, who was on site, said that "Janet did not want to disappoint her Detroit-area fans again, so we adhered to Michigan's state ordinance and trimmed the 'Discipline' segment of the show so it would not be canceled."
Jackson's show was a make-up date for an original Sept. 27 show that was one of several postponed when she was sidelined with a bout of migraine-induced vertigo.
The "Discipline" segment of the Rock Witchu Tour was cut from last night's concert in Detroit, Michigan.
That segment of the show consists of parts of the songs "Funny How Time Flies (When You're Having Fun)," "Any Time, Any Place," and then the song "Discipline" in its entirety.
It was the first time on the tour that the setlist had been altered in any way.
Janet later told the audience that the segment of the show was cut due to a local law. Right now the specifics of exactly what law she was referring to are unclear.
UPDATE: The Detroit News is now reporting that the segment was cut due to a Michigan law prohibiting the simulation of sex acts:
Michigan law prohibits simulated sex acts in a performance space; a Palace spokesperson said venue officials discussed the law with Jackson's camp and asked her to not to perform the bit in question, but did not tell her she needed to cut the song, "Discipline," in its entirety.
LL Cool J's publicist confirmed today that he has dropped out of being opening act on the Rock Witchu Tour, according to the Associated Press.
His publicity firm is citing an unnamed scheduling conflict as the reason why he is leaving the tour.
There currently are only two more dates left for the tour: Detroit on Tuesday and New York City on Saturday. The AP report goes on to say that Janet is expected to announce more dates.
While originally intended to be the opening act for the bulk of the shows on the tour, LL Cool J only ended up performing on the tour four times - Los Angeles, Chicago, Toronto, and Kansas City. A handful of other dates had been postponed due to Janet's recent illness.
Jermaine Dupri late last night posted a new video on YouTube, portions of which were filmed at last night's concert of the Rock Witchu Tour in Tulsa, Oklahoma.
Janet wore her normal mohawk wig at last night's Rock Witchu Tour concert in Tulsa, Oklahoma.
She had worn a new ponytail for the previous concert on Friday night in Kansas City, which was the only concert of the tour so far when she did not wear the mohawk wig.
Janet did not wear her mohawk wig last night at her concert in Kansas City, Missouri. Instead, she wore a long, dark ponytail, similar to the one she wore on 1998's Velvet Rope Tour.
It is the first concert of the tour that she did not wear the mohawk.
Also, LL Cool J joined the tour again and performed at last night's show. The last time he opened one of the concerts was at the Toronto show on September 28, just prior to Janet's postponement of a series of concerts due to illness.
The following list represents Janet's positions on all of the Billboard charts for the week ending November 1, 2008.
With "Can't B Good," the fourth single from Discipline, dropping off of the Hot Adult R&B Airplay chart this week, Janet no longer has any songs or albums currently charting on Billboard. Janet|Xone will not post its weekly chart updates until her next chart appearance.
Jermaine Dupri this evening posted a new video on YouTube of himself with Janet, which was filmed last night from the backstage of the Rock Witchu Tour in Houston.
In the new video, JD says that he decided to film this video because of comments that fans had been posting for him online wondering why he wasn't giving updates while Janet was sick. Janet then speaks to the camera and thanks everyone for their support.
They end the video by denying tabloid rumors that they had broken up.
Janet has just completed her return to the Rock Witchu Tour tonight in Washington D.C. She finished tonight's concert shortly after 11:00 this evening.
The show was Janet's first back to the stage after postponing a series of eight consecutive concerts due to what her manager described as a "rare form of migraine called vestibular migraine or migraine-associated vertigo."
"It feels so good to be back after being down just a little bit," Janet said from the stage, according to the AP.
The setlist, costumes, and every other aspect of the show remained identical to all of the previous concerts of this tour. Opening act LL Cool J did not perform tonight despite being previously listed by Ticketmaster and Live Nation as scheduled to appear at the show. Jermaine Dupri watched the show from the VIP booth.
The next scheduled stop of the Rock Witchu Tour is in East Rutherford, New Jersey on Friday, October 17.
Janet's manager Kenneth Crear has confirmed reports that the reason Janet postponed a series of shows during the past two weeks is because she suffers from vertigo.
From E! Online:
Janet Jackson Ready to Rock After Battling Vertigo Today 7:57 PM PDT by Natalie Finn
Janet Jackson is ready to get this show on the road. For real. Supposedly.
According to her manager, the veteran pop star will be returning to her Rock Witchu tour Wednesday night at the Verizon Center in Washington, D.C., after being forced to postpone nine shows while she struggled with a previously undisclosed illness.
"After a thorough medical evaluation, it has been confirmed that Janet's symptoms are being caused by a rare form of migraine called vestibular migraine or migraine-associated vertigo for which she is currently receiving treatment," read a statement released by Jackson's camp and obtained by E! News.
The "Together Again" singer has not performed since falling ill Sept. 29 during a sound check before a show in Montreal.
"Janet wanted very much to resume her tour so as not to disappoint her fans, but she continued to suffer from vertigo and could not perform," her manager, Kenneth Crear, said.
"She's a world-class entertainer and needs to be at the top of her game to give her fans the show they expect. She's feeling much better and is ready to hit the road again to finish the tour."
Shows scrapped in Montreal, Philadelphia, Boston, Greensboro, N.C., Atlanta, Fort Lauderdale, Fla., Uncasville, Conn., Verona, N.Y., and Manhattan are being rescheduled. Disgruntled ticket holders have been asked to hang onto their stubs, which will be honored at the rescheduled dates.
In a new message posted this evening on SayNow.com, Janet dismissed rumors that the Rock Witchu Tour is being cancelled. She also confirmed that tomorrow night's show in Washington D.C. will go on as scheduled.
The full message:
"Hey you guys it's me. It's what, the 14th of October?
I know you guys have been hearing a lot, a lot of rumors - the tour's been cancelled - none of that's true. I'm actually rolling into D.C. right now to do my first show coming back. I feel a lot better and I just want to thank all of you, each and every one of you for all of your wonderful messages and wishing well. I really do appreciate all the love and the support.
And once again, don't believe anything that you hear and you read. The tour's still on. And like I said, my first show back is gonna be D.C., which is tomorrow night, the 15th of October. So, I hope I'll see you guys there who are in D.C.
We're excited, we're really excited, and it's gonna feel good coming back. And thank you once again for everything. I love you. Bye."
An update at 3:00 this afternoon onto the website of Washington D.C.'s Verizon Center says that Janet's show tomorrow at the venue is "scheduled to go on as planned."
No other announcements from Janet's management nor from Live Nation about the fate of the show have been made as of 4:00 this afternoon.
The previous eight scheduled concerts of the tour had been postponed and new dates are still pending. The last time she performed was in Toronto on September 28.
Verona, New York (WSYR-TV) - Janet Jackson has cancelled her Monday October 13 concert at the Turning Stone Event Center.
In a statement released Friday night, the Turning Stone says Jackson cancelled the concert "due to doctor's orders."
A makeup date has yet to be announced, but once the concert has been rescheduled, tickets for the cancelled concert will be honored for the rescheduled date.
Live Nation announced this afternoon that Janet has postponed tomorrow's concert in Connecticut because of her continued illness.
The full statement from Live Nation:
JANET JACKSON POSTPONES CONCERT IN UNCASVILLE, CT
Janet Jackson's anticipated return to her Rock Witchu tour tomorrow (10/11) in Uncasville, CT, has been postponed due to doctor's orders. Tickets will be honored for the rescheduled date. An announcement will be made soon regarding a rescheduled date for this show and previously postponed shows. The Rock Witchu tour will resume on October 13th in Verona, NY at the Turning Stone Resort & Casino.
Promoters Live Nation have confirmed to Access Hollywood that Janet's Rock Witchu Tour will resume this Saturday, October 11 in Uncasville, CT at the Mohegan Sun Arena.
"Janet, who has been under her doctor's care and recuperating over the last week, is excited about getting back on the road and again being able to share with her fans what she feels is one of her best stage shows ever," Live Nation said in a statement to Access Hollywood.
A string of concerts over the last two weeks were postponed due to an undisclosed illness. Live Nation has announced that all of the postponed concerts will be rescheduled.
New dates for the shows in Montreal, Boston, Philadelphia, Greensboro, and Ft. Lauderdale have yet to be announced.
The October 5 show in Atlanta was rescheduled to October 19, and the October 16 show in New York City was rescheduled to November 1. Previously, a September 27 show in Detroit had been rescheduled to October 28 due to production reasons.
The Rock Witchu Tour concert originally scheduled for October 16 at New York City's Madison Square Garden has been rescheduled to Saturday, November 1, according to MSG's website.
The announcement came this afternoon.
Tickets will be honored at the new November 1 date. Those unable to attend can obtain a full refund at the point of purchase.
The current tour schedule with all of the changes can be seen on the main page of Janet|Xone in the sidebar. New rescheduled dates have yet to be announced for Montreal, Boston, Philadelphia, Greensboro, and Ft. Lauderdale.
The website for the Tyra Banks Show now has a short video preview on their website of tomorrow's episode of the show, which goes behind-the-scenes of the Rock Witchu Tour.
The show is syndicated and airs on different times and channels in each area.
The Rock Witchu Tour concert scheduled for Sunday, October 5, in Atlanta has been rescheduled to Sunday, October 19, according to the Philips Arena website.
Tickets for the October 5 concert will be honored on October 19.
New dates for Montreal, Boston, Philadelphia and Greensboro have yet to be announced.
Tonight's concert of the Rock Witchu Tour in Greensboro, North Carolina, has been postponed just hours before it was scheduled to begin.
According to a press release from the arena, Janet was not feeling well and was told by a local physician not to perform.
"Janet arrived in Greensboro hoping to perform tonight in an effort not to disappoint her fans," the announcement says. "However, after arriving at the Coliseum it became evident she had not fully recovered. A local doctor advised that she not perform this evening."
Tomorrow's concert in Atlanta has also been postponed.
The next scheduled concert is for Tuesday, October 7, in Fort Lauderdale, FL.
To date, six concerts of the tour have been postponed. Rescheduled dates for Montreal, Boston, Philadelphia, Greensboro and Atlanta have yet to be announced.
Tyra Banks visited Janet in Las Vegas last month and filmed a special episode of the Tyra Banks Show from the behind-the-scenes of the Rock Witchu Tour.
According to the show's website, Tyra takes a look at the tour bus, the dancers, the costumes and more. Tyra also interviews Janet from her bed.
The episode will air on Thursday, October 9. The show is syndicated and airs on different times and channels in each area.
The following list represents Janet's positions on all of the Billboard charts for the week ending October 11, 2008.
In addition, Billboard has published the Boxscores for the second and third concerts of the Rock Witchu Tour in Oakland and Los Angeles. That information is as follows:
The website for the Tyra Banks Show now has 
Tyra Banks visited Janet in Las Vegas last month and filmed a special episode of the Tyra Banks Show from the behind-the-scenes of the Rock Witchu Tour.
