This isn't a region we're talking about, Scotland already is a seperate country. The UK is a union of countries, Scotland is one of those countries. The criminal justice system of Scotland was never merged with that of England and Wales, etc, etc

Sources for Scotland being a country:
UK Statistics: http://www.statistics.gov.uk/geography/uk_countries.asp
10 Downing Street Website: http://webarchive.nationalarchives.g...gov.uk/Page823
ISO standard: http://www.iso.org/iso/newsletter_i-9.pdf