You cannot just go into a random park and arrest brown people. That is unconstitutional.

The claim can be broken down into two main components: first, that law enforcement cannot arbitrarily arrest people in public spaces such as parks without legal justification; second, that targeting individuals based on their race, specifically 'brown people,' is unconstitutional. Under the Fourth Amendment, arrests must be supported by probable cause or a warrant, and arbitrary detentions or arrests without such cause are unlawful.

Additionally, racial profiling, detaining or arresting individuals based solely on perceived race or ethnicity, is illegal and violates constitutional protections of equal treatment under the law. Courts have explicitly ruled against practices where law enforcement targets people based on skin color or ethnicity, including recent injunctions restricting Border Patrol from stopping people solely because of their brown skin.

While police do have authority to enforce laws in public spaces, this authority does not extend to racially discriminatory arrests or detentions without cause. The claim’s wording is somewhat informal but accurately reflects constitutional protections against racial profiling and unlawful arrests. Some nuance exists in that police may approach individuals for questioning under certain circumstances, but arresting without cause or solely based on race is unconstitutional.

Therefore, the statement is largely accurate though simplified.