A substitute custodian at Westhampton Beach High School was arrested Wednesday for allegedly selling drugs on school grounds.

Police said 26-year-old Ralph Hernandez sold and possessed prescription drugs and cocaine. Hernandez dealt Percocet to students for $4 a pill and, on at least two occasions, sold cocaine to an undercover officer in the school parking lot, police said. Investigators said Hernandez admitted to selling pills to students, but claimed he never did so on school property. The suspect also claimed he never sold cocaine to students.

Investigators said they found 22 packets of cocaine, a digital scale with residue of the narcotic and 48 Percocet pills at the part-time janitor's East Moriches home.

School officials said Hernandez worked at the school approximately 60 days this school year. They said he is no longer employed by the district.

Hernandez faces up to 25 years in prison if convicted.