I meant the sniffer dogs would pick up any gun fire residue including church goers who attended services the prior day. Really just guessing at this point. :blushing:
^ bbm Good point about K9 assistance.
Post #428 re GSR swabs & tests says GSR may be undetectable just several hours after gun is fired.*
K9s can follow some other scents even days later. Could K9s detect GSR from persons who attended church/were in the bldg the prior day?Any source on that?
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* https://en.wikipedia.org/wiki/Gunshot_residue. Scientific Working Group for Gunshot Residue (SWGGSR) http://www.swggsr.org .