Upon taking testimony of the medical providers, the providers conceded the claimant suffered other medical conditions which may be causing her to be symptomatic but are not necessarily related to work. Then, upon taking lay witness testimony, the various witnesses testified that it was impossible for the claimant to have been exposed to the fuel additive, as she never came in contact with it and the vents are not connected to the gas tank, so it would be impossible for it to have come out of the vents. They also testified the additive was only added once, and would have dissipated the same day, which is inconsistent with the history the claimant was giving which claimed that the additive was added on multiple occasions subjecting her to repeat exposures.