Federal lands=federal laws. I usually bring a cartridge out fishing. While I don't prefer them, they are very discreet. Not everyone enjoys the smell of marijuana and it is still illegal to consume in public. Then again its also illegal to throw your empty beer can into the river. Its all about just being mindful and respectful of others out in public. Put your nugs in your console next time. Glad the Ranger was understanding of your situation and let you off.