酒吧老板发现他的新员工其实是个向警方通风报信的线人。

The bar owner discovered his new employee was actually a ___stoolie reporting to the police.

酒吧老板怀疑有个告密者向警察透露了非法赌博的事情。

The bar owner suspected a ___stoolie had informed the police about the illegal gambling.