They absolutely use these in court (incl. criminal prosecution) in New Zealand and have since at least 2000: https://www.nzherald.co.nz/nz/lawyer-challenges-co

They absolutely use these in court (incl. criminal prosecution) in New Zealand and have since at least 2000: https://www.nzherald.co.nz/nz/lawyer-challenges-courts-right-to-access-babies-blood/6NGOO6FHXRPD3VCLBUJSA47CPE/ https://www.nzherald.co.nz/nz/lawyer-challenges-courts-right... and https://www.stuff.co.nz/national/crime/97840280/parents-upset-at-police-access-to-baby-dna https://www.stuff.co.nz/national/crime/97840280/parents-upse... You can fill out a form and demand they return the samples to you. Even if you can trust the government today, there is no guarantee they can be trusted tomorrow. cf. the abortion stuff in America.