SAN LEANDRO - Authorities are investigating claims that counselors at Alameda County Juvenile Hall set up after-hours wrestling matches involving young detainees -- and rewarded their participation with favors that may have included access to pornography. Six staff counselors have been placed on administrative leave pending an investigation by Alameda County probation and sheriff's personnel, officials said Friday. The claims first surfaced late last month when a teenage detainee told a counselor at Juvenile Hall about the wrestling matches, which allegedly occurred in the hall's maximum security unit on consecutive weekends at the end of 2004. "The people involved may...