Police are testing a new tagging spray which will link moped gangs to crime scenes.
The liquid spray tags clothing and objects with a unique chemical footprint which is only visible under ultraviolet light.
This comes as the force revealed the average age of offenders on mopeds in London was 15 - and many are travelling from the Home Counties to carry out crimes.
Police stop and search mopeds on Waterloo Bridge in London last month following the latest spate of robberies
Robbers on motorcycles armed with knives, machetes, power tools and even fire extinguishers are responsible for a terrifying crime wave.
The number of offences rising by 600 per cent in two years as they commit up to 50,000 offences a year.
In the capital alone there were 11,389 crimes involving mopeds and other two-wheeled vehicles last year, a seven-fold increase on 2015.
Detectives say they