The only explanation would be a breakdown of the QF under exposure to sunlight or a lab error. Speaking of which... this particular lab is no stranger to that sort of thing. Very interesting articles...

Lab Errors May Change Local Case Outcomes - San Diego News Story - KGTV San Diego
San Diego District Attorney Reports Lab Errors Across San Diego County | San Diego Criminal Defense
REGION: Officials say no more bad lab tests found so far
Dieselboy1 Reviewed by Dieselboy1 on . using quick fix 2day gonna be using it today for pre employment dot drug test,but its a manufacturing job no driving,hopefully all goes well....also going to test my pee and see if im neg or positive....ordered it from bings smoke shop hopefully its legit...will no when it comes in the mail!!! where do i go to check and see if its legit! Rating: 5