In a somewhat strange turn of events, T.I. is back in federal custody. Why?? Well, when he was released from prison yesterday, he took a tour bus instead of a van! Law enforcement officials tell TMZ, that when an inmate is in a low to medium security prison, they need to use a private, unescorted mode of transportation when traveling to a halfway house. Although, no drugs or alcohol were found on the bus, T.I did not disclose the nature of his transportation and that's why he is back in federal custody. T.I's lawyer, Steve Shadow is working to resolve this situation so the remaining days of  T.I's sentence can be served in the Atlanta halfway house. Durn!