Answer: Yea, you kind of have to say it when you arrest ANYONE LOL
Explanation:
The reason for this is because of the Miranda vs. Arizona case of 1966 when Ernesto Miranda was accused of crimes such as robbery, kidnapping, and sexual assault. There's way more you can read up on the case, which will drop here.
https://www.uscourts.gov/educational-resources/educational-activities/facts-and-case-summary-miranda-v-arizona
If you want a refresher on the Miranda rights, here they are.
<em>"You have the right to remain silent. Anything you say can and will be used against you in a court of law. You have the right to an attorney. If you cannot afford an attorney, one will be appointed for you."</em>
Hope this helped. :)