Okay Mark here's the thing: At that first job I spoke of above,more than likely I may have been thinking this is just another toy and it gave me something to do or keep moving while thinking of the next step. Yeah...the shutoff was high and a little out of reach,but decided to scan any way. Man did that thing go off.You see it was a basement getting plenty of air and of course the double door or cellar entrance had been open for awhile.As far as soap goes,sure it works,(sometimes).One day working for Sears I had run a brand new 1/2" black pipe line across the basement then gave it the soap test.As always I had brushed my solution at every joint , union and shutoff valve. Well guess what. Hours later and 50 miles from my home I get a call how the whole basement smells like gas. I told my customer please call peoples Gas immediately. The next day my supr sends me back to fix whatever I screwed up. Well guess what: Turns out that the pipe I used was on recall for defects in the seams in the elbows. The customer wrote a letter thanking me for giving the number to call for emergency. So the answer is yes soap does work [to confirm] what that worthless sniffer will find,so please take it out and you might end up with your own thank you note.