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With the center for investigative reporting. >> reporter: this is former security guard joshua kosatschenko taking a smoking break outside the private security company where he works in suburban phoenix. he's not carrying a gun now, but 5 1/2 years ago, he was armed and licensed to carry by arizona's department of public safety. that turned out to be a dangerous breakdown in the system. an investigation by cnn and center for investigative reporting found licensing requirements so varied and in some states so lax it can become harder to become a manicurist than an armed security guard. >> i wok...

Killed him was a then 19-year-old security guard, joshua kosatschenko who should have never been allowed to carry a gun. hey, joshua. drew griffin with cnn. how are you? we've been trying to get in touch with you. we're doing a story on security guards. how -- how did you become an armed security guard? how was that possible? >> i'd rather not comment, sir. >> reporter: do you think that you should be placed in a position where i believe you're training security guards now? >> no comment. >> reporter: it was shortly before 2:00 in the morning on june 3rd, 2009. at this convenience store in tuc...

Kosatschenko and a second security guard gave chase, a scuffle broke out. they ran. tarango threw the car in reverse. kosatschenko opened fire. >> i just heard -- when i heared gunfire, i looked back and felt the glass shatter and felt a slight push like somebody had pushed me over. >> reporter: tarango admits he should have never been there. it turns out kosatschenko should not have been working as an arounded guard there, either. he had a criminal record as a juvenile. in fact, he had several run-ins with the juvenile system. when he was 13 he pled guilty to two counts of aggravated assault....