alice smith is walking home from work when a man comes up from behind her and pushes her into an alleyway, demands she give him her purse, witness jim franklin sees the crime, runs to the aid of ms smith, the robber runs away, the police are called, officer roberts responds, gets the robbery suspects description from both ms smith and franklin, officer roberts is acquainted with a possible suspect bob who lives in the area, has committed similar offenses in the past, using the same mo modusoperandi, officer roberts goes to the police station, obtains a mug shot of suspect bob, officer roberts returns to the scene of the crime, shows the mug shot to ms smith and witness franklin, officer roberts ask "is this him?" mrs smith and jim franklin both says yes, based on this evidence, officer roberts arrests suspect bob, during the trial both ms smith and jim franklin, identify the suspect in the courtroom as the offender,, officer roberts actions at the scene appropriate, if not, what should officer roberts have done differently? are ms smith and jim franklin identifications at trial valid