Mysterious "gas" smell

[John Collins]

I do not smell nor does male tenant and his wife has not moved in yet from out of state. His realtor was at home helping him move in stuff to prepare place and said she smelt gas. We could not smell it, but I put my head under stove and smelt something like gas that was quite light. I didn't know if it was normal or not, but I got pros out to check. Did bubble foam test and infrared test and found nothing from gas lines to stove , or in the gas water heaters. Took their time , I pay extra for safety related issues. 

Realtor once again smelt it yesterday. I'm not sure how to proceed, are there gas leak detection specialists I can call? More advanced technology? It's something I want to get to the bottom of whether realtor is sensitive to it or not. 

[Lynnette E.]

Call the gas company that supplies the gas service.  Everyplace I have ever lived they will do a free detection check and let you know.  If its in the line they can fix for a fee and they will tell you if its in the appliance exactly where such as pilot light, then you will know exactly what is wrong to get the appliance fixed.