A Midlands company has helped develop a gun which fires pellets filled with artificial DNA from a distance of up to 40 metres.
The bullets leave a unique tell-tale mark on the suspect which is only visible under ultraviolet light.
More top news
Windy with outbreaks of showery rain, heavy at times across the region.
Warwickshire Police say Bethany Marie Hill, who was 20, was found with wounds to her neck at a house on Hertford Road on Wednesday evening.
The rain will clear quickly this evening with blustery, locally heavy, showers following, merging at times into longer spells of rain.