I believe it was, since there's a few areas that forest preserve has golf courses in them. But again it is speculation,that that specific person was believed to be the cause of them banning detectors. And after personally seeing him within the bounds of the city golf course in Jackson park, makes me believe it could of been. I met the guy once at a Chicago beach , before I knew of who he was ,and he seemed like a shady character to me then !!