Okay, so lots of possibilities here. Maybe white thing/cord that seems to extend to the chin is binoculars as someone has stated (hadn't thought of this). Maybe it's goggles. I still am freaking out over looking at it from a certain angle and being positive it's a mic. If it's a mic (haha, pretty big "if"), it needs a transmitter. The transmitter would be in that abyss beneath what's visible of the jacket.
If it is a tactical jacket, there are way, way better ways to position that weapon than where we see the outline on the jacket. If that is indeed a pistol, I mean it's positioned in such a way it might discharge and-- hurt the perp! Everyone else's life is cheap to such a perp, but they always view their own lives as priceless. And as someone noted on here, that is a pretty big gun, it would drag down the entire jacket. I agree outline looks just like the pistol, I nonetheless suspect it's not the pistol after all. Agreed with someone else who said well, ok, maybe he repositioned it there as he came closer to the victims. That I would think is also possible. I still wonder if that is going to turn out to be the gun after all, though.
If they actually used a radio system, it would now be untraceable. It's not like Verizon. They'd need a transmitter. They often resemble pistols. More than BG involved. That explains the much younger sketch out there circulating. It also explains how someone rolling around on that bridge looking like he's going to fall apart left such a pristine CS behind. And if he's wearing a tactical jacket, who knows what is packed in there, and those tactical jackets look exactly like what BG is wearing, one tactical jacket in particular, right down to the little cloth tie we see crossing from one jacket side to the other near the bulges in the jacket. I think he's wired and mic'd up. It's definitely a possibility, although ok, farfetched at this point. And they recovered a "GPS system" from RA's home. There are handheld GPS systems. Maybe he assumed others on the trail-- if they had seen him-- would think what was a handheld GPS was a phone, and this was supposed to be the "stock ticker." I know very little about these GPS systems, but I know they can be used not just to help the user navigate, but also for the user to track. Theories abound here. But I lean towards more than BG alone involved at this point, and the radio makes sense in line with that thinking. Still mulling over BG and RA being two of the most overdressed males on the trail that day, the fact that a catfisher is associated with one of the victims and said catfisher searched a gas station right in the area, as I recollect on that day. Said on Facebook he was meeting victim that day, and allegedly failed a polygraph. And more than anything, wondering still on the "keepsake bullet." ??? One bullet left at the CS between the victims. And another bullet in a "wooden" (??) keepsake box, which conjures up images of a small coffin. Two victims, and two unused bullets, one at the CS, one possibly in a "keepsake box." But nothing but speculation at this point and MOO>