Investigators collected ZERO video from Tony Stewart and Kevin Ward Jr.'s race teams after Saturday night's tragedy because the Sheriff says it does not exist — which TMZ Sports has learned is a little strange. Ontario County Sheriff Philip … It's odd because we're told — by multiple sources in the racing world — Stewart commonly has a mini-camera of some sort mounted on his cars when he races on smaller dirt tracks like Canandaigua. We've made multiple calls to … …

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Tony Stewart Investigation — No Video or Audio Evidence Gathered …