Over a year after William Whisman was arrested, law enforcement finally was able to access his phone when new forensic techniques were implemented. On the phone were thousands of images of child pornography. Even more troubling, investigators found chat logs of conversations Whisman had been having with other men and women about the sexual abuse of children. As prosecutors secured a prison sentence of more than 24 years for Whisman, officers began the job they should have been able to do months before – investigating those individuals, rescuing children, and trying to prevent the evil that happens too often.
https://www.justice.gov/usao-edtx/pr/legislators-must-not-allow-warrant-proof-encryption-make-america-more-dangerous-place