Similar incidents have occurred before. Eyewitnesses to other crimes have identified the wrong person in a police lineup or in photographs. Many factors influence the accuracy of eyewitness testimony.
The situation in Karbala remains unclear, but a number of medical sources and eyewitnesses backed up by video suggest at least eighteen people have been killed and hundreds wounded in clashes with security forces.
Because Propranolol is only acting on the non-declarative emotional memory, it seems unlikely that it would affect eyewitness testimony, which is based on declarative memory.