[CobaltBlue]

Don't rule anything out makes sense.

If it were me, I'd be looking at all men in Maryland who got hunting licenses recently, canvassing all stores which sell .223 rounds, and cross-referencing with all people with white vans.

Should only be several thousand potential suspects.;^)

[Grampa Dave]

Why look for guys who got their hunting licenses?

If the snipers are from out of town or state, they would have bought their own rounds.

[browardchad]

If it were me, I'd be looking at all men in Maryland who got hunting licenses recently, canvassing all stores which sell .223 rounds, and cross-referencing with all people with white vans.

Too narrow -- it would have to include surrounding states, and that, of course, wouldn't even cover a stolen/unregistered weapon that hasn't been reported. The perp isn't wasting a lot of shots, so new ammo wouldn't seem to be an issue. I also doubt the perp(s) is still driving a white van/truck -- if they ever did.

The Washington Post this morning reports that police dogs have probably found the location of the shooter in the DC killing: behind a decorative wall on church property (lovely symbolism). If it's the same type of wall that you normally see, it's not large enough to hide a vehicle, and if it is, a driver would call attention to the vehicle by pulling up directly behind it. What it seems to indicate is that the perp is not necessarily shooting from within a vehicle, as was assumed in Montgomery County. He may have changed his tactics, or may have been out of the vehicle in all cases.

[ET(end tyranny)]

If it were me, I'd be looking at all men in Maryland who got hunting licenses recently....

Should only be several thousand potential suspects.;^)

Bbbbut, wouldn't that ('This violates the presumption of innocence.') per your #255

????