[Shooter 2.5]

There was no one on the grassy knoll behind the picket fence based on the photographs and sworn testimony.
No trajectories match from the grassy knoll.
No bullets were found to the rear of the victims.
No wounds match from the grassy knoll.
The few people who claim there was “something” on the grassy knoll lied about their locations.
Zapruder filmed the corner of the picket fence and there was no one there.
The people standing on the sidewalk never claimed there was anyone behind the picket fence.

Parking lots such as the one behind the picket fence are used for automobiles which use internal combustion engines. Internal combustion engines have a device called exhaust pipes that emits exhaust, commonly called “smoke”.

[RGPII]

According to the wikipedia article; I know, not foolproof; but the figures should be fairly accurate;

104 eyewitnesses testified;

“...56 (53.8%) thought that they came from the direction of the Texas School Book Depository, 35 (33.7%) thought that they came from the area of the grassy knoll or the Triple Underpass...”-http://en.wikipedia.org/wiki/John_F._Kennedy_assassination

Hardly, easily dismissed as “The few people who claim there was “something” on the grassy knoll lied about their locations.”