The State of Florida had a problem. The drug bust over the years had filled
their storage areas with Marijuana. It was decided  the only option was to
burn all of the Marijuana on hand. The eventful day a huge mound of Marijuana 
was torched. The fire raged and the smoke of the weed raised in a large cloud. 
At this time a flock of Tern's flew through this cloud.
A group of forest rangers (aka Their environmental watch dogs) were sent out
to assure the well-being of the Terns . They followed this flock until they
finally landed. The rangers sneaking upon the terns were able to observe and
issue a report that read:  Not a Tern was left unstoned.