Three `` drug subs '' intercepted in past two weeks , Coast Guard says . Detecting the vessels is nearly impossible for law enforcement even with advancements in sonar , radar and infrared technology . Crew members sank all three , along with cargo , officials say . Comment: New law makes it a felony to travel through international waters in the vessels .
Three `` drug subs '' intercepted in past two weeks , Coast Guard says . Crew members sank all three , along with cargo , officials say . Comment: New law makes it a felony to travel through international waters in the vessels .