Snake season again

Two snakes in two days (or maybe the same one twice).  One slithering along heading in the right direction to go where it belongs out back.  The other comfortably sleeping in a drawer in the chicken house.  I dropped moth balls on it to no effect.  20% vinegar solution obviously made it uncomfortable but I doubt it killed it.  Had it been in a more accessible spot it would have suffered a more definite and permanent fate.