Evidence that no Hamas rockets were fired during the ceasefire.
The Qassam rockets are home made from sodium chlorate (weedkiller) and sugar. I remember making the same kind of rockets when I was a kid, although they did not have TNT warheads, were not aimed at neighbours and in fact did not take off from the launching pad.
So sniffer dogs could not detect the rocket fuel, but they could still detect the TNT in the warhead.
What the international community has to do is to list Sodium Chlorate as a chemical whose transactions need to be logged, and find the person who is buying tons of the stuff but has no crops to use the sodium chlorate on.