Medical records – Medical records are crucial evidence in a personal injury case. Witness testimony – Witnesses can provide important testimony about the injury's circumstances and provide insight into how the injury occurred and who may be responsible. Professional testimony – Professional testimony can be used to explain complex medical or technical issues related to the injury. Photos and videos – Photos and videos can be used to document the extent of the injury and the circumstances surrounding the injury. Police reports – Police reports can also be used to document the circumstances surrounding the injury.