The claimant applied to the LAT seeking CAT determination under Criteria 8 and entitlement to post-104 IRBs and various medical/rehabilitation benefits. Causation was an issue at the hearing. The subject motor vehicle accident occurred on April 4, 2016. At the time of the subject accident, the claimant was still recovering from an incident in August 2015, which left her with a concussion and unable to work for 8 months. The subject accident occurred while the claimant was on her way to work for the first time since August 2015. The “but for” test was applied to the issue of causation. Vice-Chair Shapiro found that while the subject rear-end collision was light, it did affect the claimant, stating “while there is a dispute of what the actual physical impact the accident had on her brain and cognitive function, I accept that it was an emotionally traumatic event.” Vice-Chair Shapiro preferred the insurer’s CAT opinions, finding that the claimant’s CAT report lacked meaningful validity testing and was generally inconsistent with the records of treating practitioners and evidence of functional abilities. Vice-Chair Shapiro found that the claimant likely sustained a mild second concussion in the subject accident, which resolved on its own. The testimony of the claimant’s treating neurologist was given less weight as she was unaware of the subject accident until she was summonsed to be a witness at a hearing, and therefore her testimony about the accident causing the claimant’s current complaints was inconsistent with her medical notes. The claimant was found not to be CAT and was not entitled to post-104 IRBs. She was entitled to driver’s therapy, plus interest if incurred, but not to the other medical benefits in dispute.