Suspicious!

This past Saturday (May 9) was the day I dropped Don off in Campo, then headed over to park the car at Lake Morena.
The plan was that Don would hike North from Campo to Lake Morena, and I would hike South from Lake Morena toward Campo then turn around where ever I met up with Don.

Shortly after crossing a road heavily used by Border Patrol, a thru-hiker sped past me headed North. Besides thinking he was going insanely fast and wondering how you'd keep up that pace for days on end, I didn't think much more of it.
A few moments later, I met up with Don. I turned around, and we continued North toward Lake Morena. Back on the Border Patrol road, the aforementioned thru-hiker sped by again, going in the wrong direction! I briefly thought he might be confused about where the trail branched from the road, but then he didn't stop to ask us for directions. And the trail was pretty well-signed. I did notice, however, that his about-face coincided with a parked Border Patrol truck. Don had also mentioned that he saw 3 illegal immigrants earlier that morning just ahead of him, and this supposed thru-hiker was also just ahead of him.
So I thought, "Is this guy helping out the illegals and posing as a thru-hiker??" The other option was that he was segment hiking, and doing an impressive 24-mile day (12 miles in and back). But I was very suspicious...

Fast forward to today. Don came across the same guy, and apparently he was just LOST. It turns out he really is a thru-hiker. And it gets even better - He was suspicious of us too!!! I can't imagine why! But then again, he was just a youngish white guy without an accent, so I really had no reason to suspect him either. I guess the overwhelming Border Patrol presence and seeing all the signs of illegals (discarded foot coverings used to avoid leaving shoe-prints) starts to mess with your head...

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Just heard back from Don about why the guy suspected us: "the guy said. so i see this asian woman walking the wrong way, then she somes back with a dude. suspicous, to him."

H-I-L-A-R-I-O-U-S! But then, even the Border Patrol stopped me a few times!

There's a check-point on Hwy-8 between the Campo exit and the Laguna exit (where the lodge is). So we passed by this several times.
On one occasion, the guard noticed me in the passenger seat and motioned for us to stop.
BP Agent: "Are you US citizens?"
Don: "Yes."
BP Agent: "What about you?" (looking at me)...

And the morning I headed home, the guard was motioning everyone through without stopping them. When he saw me, he did a double-take and made me stop.
BP Agent: "Are you a US citizen?"
Me: "Yes."
BP Agent: (waving me thru) "Have a good day."
Me: "You too." (enunciating to emphasize my lack of accent and doing a mental eye-roll)

I'm very curious to know exactly what they're looking for. Anyone non-white??