The St. Louis Post-Dispatch reports the department is forming a committee to decide how to best train officers for such encounters.
Police say they were chasing suspects inside a stolen car when it crashed June 21. The off-duty officer came out of his home after hearing the crash when an officer just arriving at the scene allegedly shot him in the elbow, thinking he was a suspect.
Interim Chief Lawrence O'Toole says an investigation is ongoing.
There are no national standards on how off-duty officers should take action and uniformed officers should conduct themselves when confronted by off-duty counterparts.
Information from: St. Louis Post-Dispatch, http://www.stltoday.com