A number of Parkland High School teachers and an aide were dismissed last week after an investigation into drug use by the employees.

According to a YISD internal memo acquired by The El Paso Times, allegations of illicit drug use by a former district employee was the catalyst for the inquiry. The Times reports that the probe resulted in the resignation of two English teachers and a computer technology teacher at Parkland High School teacher, and an aide at Parkland Middle School.

Another Parkland High English teacher who tested positive for morphine, and a janitor who tested positive for cocaine were put on leave pending further investigation. The memo states the teacher claimed he had a prescription for the morphine because of an abscessed tooth.

YISD officials would not disclose any other information, citing personnel confidentiality. The Times has a more detailed report on its website.