For crimes of supply, the single force brought in 118kg of the drug, followed by 74kg of cocaine and 6.7kg of crack cocaine.

Officers also seized approximately 25,400 ecstasy-type tablets, Drugs Seizures and Offender Characteristics, 2017-18, published by Scotland’s chief statistician, shows.

The quantity of drugs seized can fluctuate considerably each year and does not necessarily move in line with the number of seizures made.

Whilst most drug seizures consist of relatively small quantities (usually possession-related crimes), annual quantities of drugs seized can be greatly influenced by a small number of large seizures (usually from supply-related crimes).

Again, for crimes of drug supply, the main class B drugs seized by Police Scotland in 2017-18 were cannabis resin (625 kilograms) and herbal cannabis (553.4 kilograms). They also seized over 16,000 cannabis plants.

For class C drugs, the main drugs seized were 321,000 diazepam or other benzodiazepine tablets (excluding etizolam) and 264,000 etizolam tablets.

A sample of drug possession crime for 2017-18 estimated that 54 per cent of drug possession crimes involved herbal cannabis or cannabis resin, with 10 per cent for cocaine, 9 per cent for heroin and 6 per cent each for diazepam and etizolam.

In 2017-18, the vast majority of drug possession offenders were male (86 per cent). The median age of an offender was 30 years old, with almost two thirds (64 per cent) being between 20 and 39 years old.