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.
I think also being a police officer requires you to get your hands a bit more dirty; maybe use physical force to restrain criminals, maybe be faced with very difficult situations as well.
The Supreme Court will now consider whether police can search the contents of a mobile phone without a warrant if the phone is on or around a person during an arrest.