WISN-TV reports 38-year-old Jermaine Cohill, 35-year-old Ryan Driscoll, 27-year-old Alicia Ojeda and 46-year-old Yvette Wright are charged with felonies related to possession or delivery of oxycodone from the Milwaukee VA Medical Center.
The investigation began in December after a co-worker reported seeing three certified nursing assistants and a licensed practical nurse passing or exchanging medications.
The complaint says oxycodone and Percocet pills were transferred and sold among the four for several months.
They are scheduled for court March 27. A message left for Cohill wasn't immediately returned Sunday. No numbers or attorneys could be located for the others.
No one immediately responded to a call and email sent to the U.S. Department of Veterans Affairs Sunday.