Snk said that he would review this in a couple weeks but he was busy with Halloween stuff so here's a reminder.
He said "So we actually test it with 13.5 seconds- if your device runs a 15 second test in less than 13.5 seconds (WHICH IT SHOULDN'T) then you are hacking. You can't hack time..."

as u can see I didn't even pass 14 seconds.
annndddd false speedhack test results are sourced from using weapons with alternate functions in event levels which involve unusual flags ( i.e water)