A substitute teacher with a history of DUIs was seen arriving at a Wisconsin elementary school so drunk he fell out of his car — with video showing him then drunkenly staggering around the campus for hours, according to cops.

Christopher Rias, 30, was already banned from boozing while on bail for his third DUI arrest when he was seen driving drunk to Bay Lane Elementary School in Muskego last Thursday, cops said

Security cameras caught him staggering out of his car around 8:20 a.m. — then falling to his knees as he failed to walk away.

Once inside the school, he was seen clearly struggling to walk in a straight line, swaying with every step while also interacting with students — with blood tests showing his blood alcohol level was still more than four times the legal driving limit hours

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