Stuttering America's Got Talent Contestant Denies Making Up Story

Poe's audition aired Monday night -- the singer told the judges about a 2009 incident when he sustained serious injuries during an RPG blast in Afghanistan.

Poe spoke with a pronounced stutter during the audition -- which he claims he developed as a result of his war injuries. But reports surfaced yesterday that the singing veteran was full of crap -- because no such RPG injuries were ever reported.

Poe tells TMZ, the fact that there is no record of the incident is a common problem-- one that Poe says is endemic when it comes to reporting soldiers' injuries in Afghanistan.

We asked Tim to prove it really happened. He said he received treatment at a military medical facility in Afghanistan before being transferred to a medical center in Landstuhl, Germany. Tim says he was then transferred to Brooke Army Medical Center in San Antonio. He did not produce any documents to support his claim.