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Tara Reid 's claim someone had slipped a drug in her drink doesn't hold water with cops, who've found no video to back up her allegation ... TMZ has learned.

Rosemont police tell TMZ ... they reviewed surveillance footage from the Chicago-area hotel, and there's no indication -- at least based on the videos they saw -- anyone drugged Tara. Play video content

We broke the story ... Tara was taken out of the hotel on a stretcher, loaded into an ambulance and driven to a hospital. She says she left her drink unattended at the bar and believes she was drugged. Play video content

Sean P , the YouTube influencer Tara shared a cigarette with that night, also told us police investigators reached out to him Wednesday to ask about Tara's claim she got drugged. He says he

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