A hotel guest book provides police with the names of members of an international drug smuggling network. Eagle-eyed officers match a hotel in Portugal to a selfie posted on social media by someone they suspect is a mule for the gang and are then able to make multiple arrests. Elsewhere, a gang of thieves who made off with £20,000 worth of perishables from a food factory are brought to justice after a car number plate left near an abandoned trailer allows them to be traced across the country. Show less