I will say we implemented the mod recommended in Noppid's post #23 below and they stopped immediately. We left the default setting of rejecting any submission that took less than 15 seconds and have had none it picked up accidently.
We currently have it set, as default, to send us a notification on every one it rejects. It tells you the user name and email address they were trying to use, as well as how long it took to complete. Most submissions were completed in 2-3 seconds which is humanly impossible.
Buster
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