Ah, assuming you're actually there, do you have to open the door for them if they don't produce a warrant?
I don't think anyone made any attempt to show the Branch Davidians a warrant.
On the other hand, decades ago when I was a kid in Chicago, I saw a TV report where reporters went along on a police drug raid. It didn't go so well - cops knocked on the door, shouted a bit, and then went after the door with sledgehammers. (This was before the purpose-made battering rams.)
The sledgehammers bounced off the door. Repeatedly.
In due course, a small, speakeasy-type window opened up and the occupant demanded to know who was pounding on his door. Police demanded he open up RIGHT NOW.
Guy refused - said word to the effect of "You gots ta have a warrant! Ah don't has ta open lessin you shows me a warrant!"
More shouting, eventually they found the paperwork. Occupant made them hold it up to the window so he could read it, whereupon he opened the door - which was
very heavily reinforced.
IIRC, they didn't find any drugs. They were contemplating arrests anyhow for not opening the door promptly, but the guy said "Ah opened it as soon as Ah knew youse had a warrant!"
This is probably why the police hardly ever invite the press along on these things any more.