-It also says:
The average officer in the experiment was 4 times more likely to remember “external” elements associated with the threat (the type of weapon presented, the suspect’s behavior, etc.) than “internal” elements (such as an awareness of his/her own thoughts and physical behavior).
-this narrow focus simultaneously caused them to “miss other items about the scene that may later turn out to be important, and impaired their ability to provide full and complete reports about the incident
-Officers who were interviewed, on the other hand, had error rates that were “very high,” averaging more than 5 mistaken memories apiece in their accounts of what happened
Dr. Lewinski and Dr. Alexis Artwohl and others also make the following points-
The mind is not a recorder.
Memory is effected by previous experience and emotion.
Memory cannot be trusted to be accurate because of these influences.
Past experience can cause false memory.
The mind records things in order of importance not occurance.
So stress can have a detrimental effect on memory in a undamaged brain.

Good training will result in automatic bahavior which the subject will not have any memory of.