I was on the same hunt. One of the guys on the quads was going on another trail when he had the run in with the guys. Says one of the smugglers stepped out onto the trail. Asked what he was doing out there, he told him scouting the area for an upcoming hunt. The guy told him to turn and leave. They guy on the quad had his young son (5 or so) with him on the quad, he thought the drug smuggler may of had a unusual moment of compassion due to his son. Said riding away with his back turned to the drug smuggler was the longest 15 seconds of his life until he went around the hill.
The weekend of the hunt, we had a small plane fly real low over our camp and land just out of site (there are not airports in the area and it had no numbers on the side of the plane). Took off about 30 minutes later and was gone. Needless to say we didn't hunt that area of the unit that day.
It's a shame when you don't only have to watch for mountain lions and rattle snakes, but drug smugglers that will kill you much quicker then any wild animal.