Websters defines poacher as:

Main Entry:
1poach·er
Pronunciation:\ˈpō-chər\
Function: noun
Etymology: 2poach
Date: 1614
1 : one that trespasses or steals [/align]2 : one who kills or takes wild animals (as game or fish) illegally [/align][/align]DT, as this guy took the deer illegally, how is he not poaching?[/align]