VILLANOVA, Pa. (AP) - Authorities say the dean of Villanova University's law school was involved in a prostitution investigation before resigning last week. State police say Mark Sargent was seen leaving a suspected house of prostitution in suburban Philadelphia just before a raid Nov. 25. He was not charged. Instead, police say Sargent was one of two customers who provided information to authorities prosecuting the case. The owner of the Kennett Township home recently pleaded no contest to promoting prostitution; two co-defendants pleaded guilty to the charge.