The grease, more commonly used to detect thefts, shows up under ultra-violet light, allowing officers to see if someone has come into contact with an object. Kent Police have been trialling the substance as part of a test pilot, supported by the College of Policing.
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Officers from the East Kent Proactive Domestic Abuse Team decided to apply the liquid to the windows of a victim of stalking, following the release from prison of an offender who had previously breached a restraining order designed to protect her.