 SmartWater has been used to convict criminals and the company says that it has secured hundreds of convictions in the United Kingdom and the United States, with a 100% conviction rate.The Metropolitan Police of Greater London, in conjunction with the SmartWater company, had as of 2017 fitted suitable detectors in all custody areas, and supplied them to patrol staff; prisoners are routinely scanned.They said "criminals contemplating attacks on Co-op ATMs [which are fitted with SmartWater sprays] should take note".