Police didn't do anything to catch these guys. Snipers wanted to get caught. Sniper bragged about killing in Alabama where the Credit Card was stolen during liquor store robbery. What else more could you give the police in order to get caught? How did the Police connect the dots?
If it's true he was dishonorably discharged from the Army, this may be his motive for killing so close to D.C. I'm glad he and his step-son were caught. Hopefully they are the ones and the charges stick.