Especially because it's been so horribly abused in the past. Take this case in Manassas, Virginia. 17 year old texts a picture of his penis to his 15 year old girlfriend. The police find out, charge the 17 year old with distributing child pornography, and take pictures of his penis saying they need it for evidence[1]. They then get a warrant from the courts demanding that the 17 year old send them a picture of his erect penis[2]. And if he didn't comply:
> If he doesn't cooperate, the Manassas City Police Department has threatened to take him to a hospital and medically induce an erection with an injection, attorney Jessica Harbeson Foster toldThe Washington Post.
Eventually they backed off when it received widespread attention in the press. Later it turned out that the detective in charge of the case was a pedophile[3]:
> A Manassas City police detective, who was the lead investigator in a controversial teen “sexting” case last year, shot and killed himself outside his home Tuesday morning as police tried to arrest him for allegedly molesting two boys he met while coaching youth hockey in Prince William County.
When I read stories like this, I'm at a loss for words. No one in the justice system realized how terrible this is? Not only does this show the problem with giving law enforcement this kind of power, but I think it shows that we really need some sort of public advocacy department to monitor and go after this sort of abuse (someone to watch the watchmen).
The kid in the case got probation, by the way.
[1] http://time.com/2971033/virginia-police-search-warrant-photo... [2] https://www.usatoday.com/story/news/nation/2014/07/09/virgin... [3] https://www.washingtonpost.com/local/public-safety/manassas-...