The Charles County Sheriff's Office just posted this alert:
They said they are not currently aware of the type of snake(s).
We wanted to make you aware of two recent events that occurred in St. Mary’s County. Recently, unknown subjects placed live snakes in a bag (one was reported as a duffle bag) and discarded the bags in a parking lot. Passersby found the bags and were startled when they opened the bags and found living snakes inside. There is a possibility the subjects waited nearby to watch the reaction of those who found the bags. At this point, investigators are looking into the possibility this may be a prank. Please be cautious if you discover discarded luggage, bags , boxes or containers. And, if you see something suspicious say something and call police immediately.
They said they are not currently aware of the type of snake(s).