"Suspects" To "Persons of Interest" has been brought up more than once and although I may not agree with the poster, I do agree that this designation may be important. After going over the proper use of these words by definition. I came to realize the change may be due to LE being very careful with the language they use, especially during a press conference. Both to be clear and to avoid legalities down the road.
If they had found 3 men hiding in the swamp that day, they could be called suspects. Because they were in the immediate area of a crime and fit the witnesses description, although vague.
Since they were not found that day in the swamp, and there is no living witness to confirm that they were at the scene, they would have to be downgraded to POI. Because now they are not directly linked to the crime scene. Then If they do end up questioning a POI, and that POI gets linked to the scene through evidence or witness, they could be named as suspects.
I know the change in title didn't happen simultaneously with the release of the search area, but I think they are choosing their words more carefully as the days go on.
That's all completely understandable pretty much common sense.
It still shows Le does not have any significant evidence to show the three individuals were ever actually there as radioed in by the Lt.
The question becomes "how long can they justify a search for persons of interest - based only on some foreign dna and the radio traffic of an individual who just may have been making the whole thing up?"