One water sample was positive for cyanotoxins downstream of where they were found. Other samples were negative. Gases and blunt trauma were ruled out. One article yesterday said they were again looking at lightning. It may not be easy to prove a cyanotoxin death of a human. It would be the first in the US.

Right after the bodies were found, on a water quality site, they outright listed the deaths as suspected water toxin. Three days later they changed it to suspected "illness" with no physical proof of either.

The heat index that day was up to 111 F and the wet bulb globe temp 89 F. When people are compelled to hike with toddlers in those conditions and they can't use or drink (because of toxin scare) any of the natural waters, what do you think will eventually happen? Heat related deaths happen every year in Grand Canyon and Death Valley.