My friend was brought down for questioning for a crime . he has an aliby that is me and him were in my apartment in Little Italy. but anyway the crime is he "supposingly" shot a car with paintballs. Now i wanted to know is their any way to test a paintball gun to see how long ago he shot it? or how recent? or whetever. any help would be appreciated. also can they test the paintball shell? to see how long it was on the car on the street.