Does anyone know anything about the abandoned Glenn Dale Hospital in PG County MD?

Me and some friends are going to go ghost hunting at the abandoned Glenn Dale hospital in MD this month, but we do not know much about the hospital itself. A couple of resources say that it is guarded by people and you could get fined or arrested for trespassing....is this true and if so is it true for the entire area? Also I would like to know if there is a way around the guards if guards are present. If anyone has a map of the layout of the place or could maybe make one or find one to share it would help out a lot because we are planning on exploring the place at the witching hour. As well, if anyone knows any possible dangers or hazards that I should know about before entering the structure I would be very happy to know. Thank you.