Several items are missing from the school's supply storage area. The custodians' shared work office is housed in the supply storage area. Working with local police, school officials have security cameras covertly installed in the supply storage/custodial work office area. No one is recorded stealing supplies from the school. But security cameras recorded a group of custodians engaged in illegal drug use in the supply storage and work office areas. School officials fired the identified custodians and police arrested them for possession and use of illegal drugs on public school property. The charged custodians (P) want the security camera evidence suppressed, claiming an unlawful intrusion on privacy by school officials and police (D)