The library now has a subscription to a new database, Blackstone's Police Service. This contains a number of key policing textbooks from Oxford University Press:

Blackstone's Police Manual Volume 1: Crime
Blackstone's Police Manual Volume 2: Evidence and Procedure
Blackstone's Police Manual Volume 3: General Police Duties
Blackstone's Police Operational Handbook
PACE: A Practical Guide to the Police and Criminal Evidence Act 1984.

You can access the collection on the Databases A-Z or use MetSearch to find individual books.