"DNA that the public supply to private firms to trace their ancestry should be available to police investigating crimes, says a majority of Britons."
See: DNA supplied by public to trace their ancestry should be available to police, according to majority of Britons (The Telegraph, link):
“Some 55 per cent of people believe that the police should be able to access the DNA records of people held in private databases, according to a YouGov poll of 1,621 adults.
About one in 20 (five per cent) of Britons, equivalent to around 2.5 million people, told researchers they had used a DNA test kit, with a further eight per cent, saying they planned to do so in the future.”