In the case of the police requesting to gather a DNA sample, a search warrant is not required to obtain samples from a suspect for several specific offences, including for murder and sexual assault.

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In many jurisdictions, police typically require a search warrant or the suspect's consent to collect a DNA sample, unless the sample can be collected from something the suspect has discarded (e.g., a cup or cigarette butt). The requirement for a warrant is to ensure the suspect's Fourth Amendment rights (in the United States) or equivalent protections in other countries are not violated.

In the Case of the Police Requesting to Gather a DNA