If the chemtrails people actually wanted to do a CSI (crime scene investigation) approach, all they have to do is observe this or any other plane at the airports to see if anything were being loaded which could be making so-called chemtrails.
If nothing is seen happening on the ground over time, and persistent trails are observed, they need to modify their views.
This isn't a new idea. Years ago Dane Wigington and the other California believers were claiming that no commercial airliners flew along the west coast which could account for the trails they saw. They claimed, and still claim that USAF tanker jets are making the trails. Despite being fully informed that those claims were wrong, they have continued and have never taken a logical, factual CSI approach to resolving their suppositions. It was shown that the contrails they saw were co-incident with ordinary commercial passenger flights.
https://www.metabunk.org/debunked-only-four-airliner-flights-day-over-mt-shasta-ca.t622/
An approach which could shed real facts on what they are seeing would include identification of the planes they see and ground observations at airports. The CSI process could include high altitude photography, ground observation, and even people boarding the flights to see what happens.
The problem with this approach is that it could actually resolve the conspiracy theory at which time most of those making the claim would have to eat crow and be proven wrong. Very few are willing to take that humbling chance, preferring to wallow where they are instead.
https://www.metabunk.org/14-years-of-chemtrails-comments-and-suggestions.t100/