No, Ellen Pompeo, most famous for Dr. Meredith Grey, has never appeared on Law and Order SVU.
She did, however. appear in two episodes of the original Law and Order series; the 1996 episode called Savior playing 'Jenna Weber', and the 2000 episode called Fools for Loveplaying the character 'Laura Kendrick'.
No, Sandra Bullock has no credits for a Law and Order series.
Blake Lively's credits do not list any appearances on any of the 'Law and Order' series.
Malcolm-Jamal Warner has no credits for any of the Law and Order series.
None of the main cast of Law and Order: CI was an actor by the name of Dan. One of the lead characters on Law and Order: SVU was played by actor Dann Florek as Captain Donald Cragen (331 episodes).
Actor Richard Wisker was born June 14, 1994, which made him 15 for his 2009 appearance in Law and Order.
No he did not appear.
Jordan Ladd has no credits for any of the Law and Order series.
Yes, Patricia Richardson did appear in the 1999 'Wanderlust' episode of Law and Order SVU.
50 Cent has no listing for any of the Law and Order series, but he did appear in an episode of the Simpsons called 'Pranksta Rap'.
Sex And The City
Law & Order
Yes, Michael Learned appeared in the 2003 episode of Law and Order SVU, "Privilege" (season 4,episode17) as the character Candace Laverly.
Kathleen Turner appeared in Law and Order 2006 episode called 'Magnet' (season 15, episode 14) as defense attorney, Rebecca Shane.
Actor Richard Wisker appeared in the "Unloved" episode (season 1, episode 2) of Law and Order: UK as the character Jono Blake.
Lucie Arnaz (daughter of Lucille Ball and Desi Arnaz) appeared in the title role of the 2003 Law & Order episode called "B*tch".
writ of habeas corpus
Your question is a non sequitur. A subpoena is simply a court order to appear. I can't envision any scenario where it might contravene copyright law.