They will only go after prey they are sure they can catch.If a cheetah expends all that energy and doesn't make the catch, they're out of a hell of a lot of calories. If a DA doesn't make the conviction, they tarnish their record- and every DA wants a million convictions and no losses.
In this case, the DA could have been swayed by some external force- i.e. the professor had friends in high places, but that's not necessary for all this to have gone down the way it has.
Instead, there's a much simpler explanation.
First, understand that in pretty-much every case I've
ever read about, involving
any contraband data typically stored in bulk (i.e. child pornography, MP3 music rips, pirated movies, etc.) how it usually goes down is:
1. The DA over-charges the person. So, they slap a charge of X counts of possessing child pornography. Then (and I'm also kind of mixing in my experience with pirated songs, etc.) they slap them with attempt to distribute- which could be based on very flimsy evidence multiplied by the number of counts of possession. And so on and so on. This is a really important tool for the DA: The ability to shotgun the defendant with as many
serious charges as possible. So that the DA can then...
2. DA offers plea deal to the defendant, usually for just
one single count of possessing child pornography, or copyrighted music, or whatever. So if you opt to go to trial the DA has so many charges against the defendant, it makes them fearful that (even if they're innocent) if just
one of those charges sticks and they get convicted, they're fucked. However, the DA's plea bargain even has a reduced sentence and so it's very attractive to a nervous (even if innocent) defendant.
Now by this point most people will take the deal the DA offers. Again, the level of fear about a conviction affects guilty as much as innocent. And most people can't afford a good lawyer. If they choose to go to trial, all of a sudden
both the defendant and the DA are on the line: Somebody's going to lose, and it's going to cost the loser quite a bit.
Ok, now there are two things which are very important in this article and neither of them are focused on hugely, but one of them might slip by most readers.
First, that the professor had lawyer-ed up
immediately and was aggressively going after every defense which might apply. I.e. there was no password on the computer, anyone could have accessed it, etc.
Second, and in my opinion this is really telling, is that the unidentified witness who leaked the information to the newspaper appears to have worked at the computer repair place where the pornography was discovered
and they were subpoenaed by the professor's defense. Now, to be fair, there is also the chance that was a policeman who was in charge of the forensic discovery on the computer. It kind of doesn't matter. What matters is that the professor's defense was going after them, almost certainly to prove an error in the
"chain of custody" of the evidence.
This is
key because, remember, when a person is convicted by a jury of their peers it is
"beyond a reasonable doubt". So any lawyer is going to go after absolutely everything (regardless of whether the client is innocent or guilty) to attack the certainty that the DA will try to present that the defendant committed the crime. You might want to also just peruse
Evidentiary Standards of Proof to get a better idea about all the different ways the professor's lawyer would probably undermine the DA's case, given a basic understanding of how the pornography was found, what the technicians were trying to do, etc.
This, and the fact that a "Police were only able to confirm that seven of the pornographic images included actual minors." means that the DA can't as easily shotgun the defendant with charges. In fact, on cross-examination the veracity and training of the policeman might come into question as far as their ability to identify a minor, visually. I really don't know, I'm more used to cases involving computer piracy of music or video.
Point is, the professor was making himself a very unattractive target for the DA. The DA looked at his chances at a jury trial and thought the better of it. Simply put, the DA didn't want to roll that pair of dice.
None of this has anything to do with the actual guilt or innocence of the defendant, by the way.
PB