Final answer:
The federal courts have decided it is not an invasion of a suspect's privacy to be asked for a DNA sample when brought into custody.
Step-by-step explanation:
The federal courts have decided it is not an invasion of a suspect's privacy to be asked for a DNA sample when brought into custody. This ruling was established in the landmark case of Miranda v. Arizona, in which the Supreme Court held that suspects must be informed of their rights, including the right to remain silent and the right to have an attorney present during interrogations. The Court stated that prosecutors cannot use statements made during custodial interrogation unless the suspect was properly informed of their rights.