In order to obtain voluntary DNA evidence from a suspect,a signed authorization should be obtained as the suspect has a legal right against self-incrimination.

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This is true. Even though obtaining a suspect's DNA evidence can be an important tool in an investigation, the suspect has a constitutional right against self-incrimination, which means they cannot be forced to provide DNA evidence without their consent or a court order. Therefore, a signed authorization should be obtained before collecting DNA from a suspect voluntarily.

In Order to Obtain Voluntary DNA Evidence from a Suspect,a