You can use HeinOnline's SmartCILP to learn when new articles are published in a particular subject area. SmartCILP provides weekly email listings of all the articles that have been published in a selected area or selected areas. It incudes links to the articles in HeinOnline, Lexis, and Westlaw. You must have a MyHein account to use SmartCILP. You can find out more about SmartCILP, including how to sign up, from the HeinOnline Resource Guide.
Here is a complete list of over 100 CILP subject headings, including Criminal Law and Procedure. You can also subscribe to the Criminal Law and Procedure Group, which includes all of the following subject headings: Criminal Law and Procedure, Evidence, Law Enforcement, Sentencing and Punishment, Sex Crimes, and Terrorism.