As everyone else has said "doped in" doesn't seem to make a lot of sense here. Because of the context - it being about snipers - I wonder if he said "scoped in", as in the scope on his rifle was zoomed in on the person? It's not a common phrase, but I think I've heard it, or I can at least imagine someone saying it. - I scoped in on the target until it was right on the cross hairs.

i’m a native english speaker and i’ve never heard “doped in.” especially in reference to a sniper. the only time we hear that used is when an athlete gets caught using performance enhancing drugs - DOPING, but never DOPED (or doped in). hmmmmm... maybe it’s misspelled??? are you sure it’s “doped in” and not “dialed in?” long range rifles have dials on their scopes.

Hey, I have never heard that term before and I googled it just to confirm. The only definition of doped I can provide is that it's slang for being under the influence of narcotics, which in this context wouldn't make sense.

Eu acho que é mesmo no português, é dizer. Doped = dopado, Uma pessoa que Consumo de substâncias excitantes ou estimulantes.