From The Washington Post:

A Montgomery County man was arrested after a researcher tracking a radio-equipped turtle in Rock Creek Park found the animal standing in a garden of marijuana plants in a remote area of the park, police said today.
…

The researcher notified authorities after finding the plants -- about a pound and a half of marijuana worth roughly $6,500 when sold in smaller amounts on the street, police said. Lachance said investigators covertly watched the marijuana garden until a man showed up to tend to the plants.

Although the turtle wasn't trained to sniff out marijuana, it's fairly obvious that's what happened. This is Rock Creek Park in Washington, D.C., a short distance from where I grew up. Trust me, those woods aren't crawling with clandestine cannabis cultivators. The turtle found what may have been the only outdoor marijuana growing in the whole city and I refuse to believe it was a coincidence.

Hypothesis: turtles are hippies. I assume the researcher has taken copious notes to that effect.