PA, Colorado has laws agin that sort of thing. Taking a bull moose illegally would set you back somewhere in the neighborhood of twelve thousand dollars. After a monster bull elk was poached in a neighborhood several years ago, the legislature passed the "Samson Law", which tacks huge penalties onto the basic offenses for shooting a trophy animal.

33-6-109. Wildlife - illegal possession. (3.4) (a) IN ADDITION TO THE CRIMINAL PENALTIES LISTED IN SUBSECTION (3) OF THIS SECTION, THERE SHALL BE ASSESSED A FURTHER PENALTY IN THE FOLLOWING AMOUNT FOR EACH OF THE FOLLOWING BIG GAME ANIMALS ILLEGALLY TAKEN:

(IV) FOR EACH BULL MOOSE, TEN THOUSAND DOLLARS;