Online Diplomas in Law Enforcement are a great way to study police science in the comfort of your own home. Students who are interested in a rewarding public service job often discover that online diploma programs in law enforcement help fit the bill perfectly. Fascinating topics that may be covered in online classes include surveillance techniques, handwriting analysis, fingerprinting techniques, police safety procedures, criminal law, and crime scene investigation. On-campus diploma programs in law enforcement may also offer physical training and self-defense, firearms discharge, and apprehension procedures.