I saw that, and I LOVED that the sniper rifle came paint job had a high gloss finish. Nothing like the shine off your stock giving away your position.
Are police marksmen really that concerned about "giving away their position" ?
They are not field craft stealth experts
They are not operating behind enemy lines
They are not taking a shot and then having to sneak out of a hostile enviornment without being spotted
They are generally not worried about return fire following an engagement.
When the police deploy marksmen, aren't they really hoping that knowing there are marksmen out there will demoralize the suspect and assist in negotiations? Wouldn't you want them to be able to see that there are marksmen deployed?