How many FBI agents must participate in 6:29 am raid on your house before you are in custody?

Evidently, the answer is something less than 23, which was the number of agents who raided the defendant's house in the case of U.S. v. Colonna. In that case, the Fourth Circuit in an opinion by Judge Gregory, joined by Chief Judge Williams and District Judge Wilson of the W.D. Va., reversed the conviction and ordered a new trial, concluding that the defendant's statements to the agents at his house should have been suppressed for violation of his Miranda rights.