[APBaer]

"give the defense lots of grist for the mill of "reasonable doubt"

We know from other threads that the FBI and other law enforcement agencies have been caught from time to time faking evidence.

The problem arises when the unrelated Town of Goodness puts Police Technician Jones on the stand because you cannot impeach him with the bad acts of others.

You can't say we know that x, and we know that Y were introducing phoney evidence. Judge wouldn't allow that because it does not relate to, or show any indication that Jones would do the same.

[Black Agnes]

Doesn't have to be LEO's doing it. Can be some sneaky criminal planting evidence that *he* wasn't the one that did the crime. You leave DNA everywhere and it's not that easy to destroy (RNA is however but that's another story). The glasses you drank from at the restaurant last night, the kleenex you sneezed in & threw away...use your imagination.