Note that InStr is case-sensitive. So "No" is not the same as "no".
Not necessarily true. If the parameter is omitted, it defaults to your Option Compare statement. That may or may not be binary. I'd say in most cases it is not.
@Raddle, post more than one line of code so we can see what you have. Please use code tags and indentation for more than a few lines (# on posting toolbar). Is the yes or no buried within other words or is it a single value?
The more we hear silence, the more we begin to think about our value in this universe.
Paraphrase of Professor Brian Cox.