Sandusky will use a private investigator on his case. (Associated Press/Pennsylvania Office of Attorney General, Commonwealth Media Services)

Jerry Sandusky, the former Penn State assistant football coach accused of sexually abusing boys over a 14-year period, is working with a private investigator in his quest to prove his innocence, his lawyer said Monday.

What’s unclear is how the arrangement differs from business as usual in the criminal defense world. Private investigators work with defense teams all the time.