If you are stopped outside the park again, let me know, Im a biologist and I work with CDFG alot, I know the Warden for the Coachella Valley and I will be glad to pass the word on. If it was a park ranger they are outside their jurisdiction and know it, they rely on a guilty conscious and fear to get their quotas filled. If you are outside the park and its a BLM ranger than as long as you have your license and you are polite they should not hassle you. Whitewater is a public road, they cant do anything as long as you are legal, and as far as wearing your license above the waist, pin it to your shirt and you will be fine.
I would like to meet some of these overzealous little men, MY permits allow me to collect in parks, out of parks, and I can work with Gilas, not too mention Ive got more time on the toilet than most of these youngsters carrying guns around have in the field.