Traps are checked first thing in the morning mate so they don't sit in the sun for hours. And if its not possible to check the traps at a reasonable time or are unable to check them you either pull them out or don't set them.
Did you try it while sitting in the sun for a few hours
If the traps were as bad as people thought they were or make them out to be I would have no fingers left.
Calm yourself I am winding Darcy up.