Hockey, I can't think of any reason that the casino would have federal employees working security. Some of the casinos have local police working their own security which is in addition to the private casino security (for example, Windsor casino has an OPP group that JUST works the casino, cameras etc, the Detroit ones have members of the Detroit PD Gaming division etc) but I can't imagine there are any Federal cops there. The only ones that might be, if they are in fact working there and if the casino is on reservation property would be the Bureau of Indian Affairs but I've never heard of them working there. They may very well have MSP or local police as well as tribal police but... I could be wrong.
I am a Paladin, like the warriors of old, ready to stand on the line to keep others safe... A Sheep Dog, ready to protect the herd from advancing wolves!