TexasCHLforum.com

Typically - Federal law enforcement officers can 'assist' in chase, apprehension, and arrest, in cases where State laws have been, or will be, violated - but, no - there really is no requirement to show a CHL. HOWEVER - if someone was subjected to a terry search and a firearm was discovered - one might find themselves at the point of a gun/stuffed and cuffed/charged with Federal fireams violations/whatever - until the situation could sort itself out (if ever). If you were carrying on Federal land where carrying (with or w/o a CHL) a handgun is legal (most US Forest Service; soon the NPS system; etc.), when stopped by Fed LEO - it would be simply the best move to identify the gun and note the CHL (esp in the NPS system where the regulation is specific to the State laws permitting carry). Just my opinion...

Federal 'Park Rangers' come in all flavors - for example, NPS has law enforcement rangers, but also has 'interpretive' rangers and other park rangers that are not 'law enforcement' but they are 'regulatory enforcement' with citation authority. The Corps of Engineers has regulatory (citation) type rangers. Because the Corps rangers do not have chase/search/interrogate/arrest authority - the Districts that they work in have agreements with local and State LEO for assistance - the local/State LEOs can arrest/interrogate and, if needed, hold a suspect until the US District Attorney for the area can file charges (which happens very fast).