Last year saw many changes to criminal law at the national and state levels. For example, Grady v. North Carolina resulted in a decision that nonconsensual, mandatory satellite-based monitoring of certain sex offenders does not qualify as "reasonable search" under the Fourth Amendment. And in State v. Vanzandt, it was decided that any official records sealed pursuant to R.C. 2953.52 cannot be made accessible for any other purpose than those provided in R.C. 2953.53(D).
If you are interested in an overview of criminal case law in 2015, Attorney Todd W. Barstow has written up a presentation on the topic for the Central Ohio Association of Criminal Defense Lawyers.