Lindsay Lohan's Porsche -- No Evidence of Car Smashery

Lindsay Lohan's Porsche didn't strike ANYONE or ANYTHING last week ... at least that's the impression cops got today after inspecting her ride.

TMZ has learned ... investigators gave the car a full body inspection to see if it had any signs of damage that synched up with allegations she struck hookah bar manager Thaer Kamal last week and then fled the scene.

Sources tell us Kamal's lawyer, Mark Geragos, has told Lindsay's lawyer ... in addition to striking Kamal, surveillance video shows she struck two cars.

There are multiple witnesses who say the allegations are all BS ... and claim Kamal is making up the whole thing in a shameless cash grab. And sources say ... the surveillance video does not show Lindsay's car striking either a car or a person.

Although both Lindsay and Kamal had initially refused to speak with cops, we're told they have both had a change of heart.