How to Abuse the Hearsay

The dying declaration is left over from thirteenth century saxony. The idea is that people make up self serving things, says the judge. So if a witness comes in and tells police, i saw this person do it, but then doesn't want to testify anywhere, are they does that like the mafa sk intimidate the witness out of testifying? But off the top of my head, you can see how many trials i do, i think that that does not, i'm ling to come up with what hearsay exception that would be. I'd want to go back through the list of like, unavailable declaring in the rules, and i' i'm sure i could concoct an argument