Dealey Plaza in November is high season for conspiracy theories.
Magazines, tapes and gruesome autopsy photographs about JFK's assassination can be found near the plaza, and the vendors most often find visitors eager to buy into the general suspicion that there had to be a wider plot.
"A lot of these people have just served to muddy the waters; to make it worse," said Dave Perry. "They start showing that shots came from the sewer or from places that didn't exist in 1963."
Perry is a conspiracy buff turned conspiracy buster. He even volunteered with the JFK Assassination Information Center – which was then considered ground zero for the Dealey Plaza regulars.
Outlandish or not, the stories resonate -- tales that are told, then sold.
"When I came to Dallas about 25 years ago, I was very pro-conspiracy," he said.
His transformation came when he began to apply his training as an insurance adjustor.
"What would happen is, I would start looking at a particular argument for conspiracy with the idea of proving it," said Perry. "And then I would start looking at the facts, and none of them ever worked out."
Perry's website, DavesJFK.com, lays out all the theories he says he's debunked in his quest to get at the truth. He's compiled a list of all the assassins that conspiracy theorists have claimed were involved.
Still, 50 years later, visitors come from around the world to take pictures at Dealey Plaza, often dodging traffic to stand where JFK was shot.
"I don't know if Oswald A, worked alone, Or B, was put up to it," said Sally Gillen, visiting the plaza.
"When you are standing right here, and you see the ‘X' in the middle of the road, and you go behind the fence, and you try to work out for yourself, how did it all happen?" said Liam Lennon, visiting from Scotland.