Does anyone know why LE doesn't publicly declare people innocent or not a POI as a general rule even when they know it to be true? It would be great if they did, but I suppose they have their reasons.
We've seen that in recent cases here on websleuths. DC Murder - the wife was a suspect (naturally) here in threads, but never declared to be uninvolved, a POI nor was she cleared publicly by LE. We now know she's not involved, but until the arrests and confessions, nope. Also, Jessica Chambers' murder: her father has not been cleared publicly, nor has he been named as a person of interest, but we are left so speculate nonetheless. No arrests yet. We did see a letter the sheriff or the DA (?) wrote to the life insurance company saying he wasn't involved, but that was so they would release the funds and the father could collect. Other than that leak, I haven't seen any public declaration of innocence in that case.
LE did clear a local merchant who was receiving death threats because of his country of origin and for no other reason. He was thoroughly investigated and publicly declared not a person of interest, so he could leave the area. That was an extreme case due to vandalism and overt death threats.
In the Savopoulos murders, a public statement was made that Jordan Wallace was not involved, but that's because they had arrested someone whose DNA was at the scene and it was a grand jury hearing. The defense was seemingly trying to skew attention away from their client to JW. But for that, I don't think the statement would have been made on the record.
Other than that, I just don't recall LE of any type being happy to clear someone of suspicion.