Perhaps you are not aware that NOAA  has their very own enforcement officers who enforce the laws protecting sea life, the fisheries etc. They are trained law enforcement officers who carry guns, issues tickets and make arrests. I have a neighbor who is a NOAA "cop".  If a sea mammal is illegally killed, they investigate and make a case if they can determine who is involved. Sometimes they video tape or have cameras set up to video tape. 
We have them in Southeast Alaska but then we are/we're home to the NOAA ship too. 
I know they are in Sitka and Juneau too.
After they investigate they will forward case to U.S. Attorney's office unless someone else is sent in to investigate. They work with other law enforcement agencies too. They do a really good prevention and education presentation at the Whale Festivals and in schools. 
Neat video about them. 
http://www.nmfs.noaa.gov/ole/index.html