First Minister Nicola Sturgeon slammed the 'despicable' scammers.
Overall crime has fallen by 45% since 2008-09 while violent crime has declined by 48%, an official survey shows.
Alexander McPhee, 33, targeted a number of pensioners in the Falkirk area during the space of one day earlier this year.
The blackmailer claimed to have video footage of the victims watching pornography.
Officers from the North Ayrshire priority policing team said it was an 'unprecedented time'.
Sidney Ochouba, 40, and Busayo Oladapo, 38, used bogus names to con seven victims between 2014 and 2015.
Jordan Henderson used the fake prescriptions to obtain medication, particularly tramadol and diazepam.