TV Guide Sky Witness Tuesday

Father-and-son dog handlers John and Kevin Tozer join forces with their Alsatians Charlie and Floyd as the Metropolitan Police dog unit raids a suspected cannabis den. However, retirement beckons for John's canine companion, leaving 13-month-old Herbie as a possible replacement - if he can make it through basic training to join London's dog squad elite ranks. Narrated by Ken Stott

Documentary following the work of Ireland's border force officers as they fight to stop gangs of organised smugglers from bringing drugs, money, guns, cars and even exotic animals into the country

Fly-on-the-wall documentary accessing the world of national security at Australia's biggest airports as customs and immigration officers tackle drug runners, illegal immigrants and terrorists

Fly-on-the-wall documentary accessing the world of national security at Australia's biggest airports as customs and immigration officers tackle drug runners, illegal immigrants and terrorists

An insight into the work of the police dogs of the West Yorkshire force as they hunt for drugs and track down burglars. Also featured are two of Europe's most famous canine detectives, Eddie and Keela - formerly employed by South Yorkshire Police - whose skills have been used in the hunt for Madeleine McCann and the investigation into allegations of child abuse in Jersey. Narrated by Ken Stott

Fly-on-the-wall documentary accessing the world of national security at Australia's biggest airports as customs and immigration officers tackle drug runners, illegal immigrants and terrorists

Fly-on-the-wall documentary accessing the world of national security at Australia's biggest airports as customs and immigration officers tackle drug runners, illegal immigrants and terrorists

Fly-on-the-wall documentary accessing the world of national security at Australia's biggest airports as customs and immigration officers tackle drug runners, illegal immigrants and terrorists

More than 20,000 people enter Australia every day be sea and by air. Fly-on-the-wall footage captures the planning and implementation of large scale operations such as major drug and weapons busts, as well as the discovery of strange and bizarre objects people try to smuggle into the country

Five people are found dead in a car, having apparently taken their own lives - but evidence indicates one of them had tried to escape from the vehicle, suggesting he may have been set up to be killed alongside the members of a suicide club. Detective drama, starring Vincent D'Onofrio, Kathryn Erbe and Jamey Sheridan

The TAC team worry about jury bias when Bull mounts a murder trial defence for a Black Lives Matter activist who is also the son of the man who inspired him to start his trial science company