It is not legally permissible in the United States to arrest someone solely based on their race, including being Black; arrests require probable cause of a crime.
You can be arrested just for being black in America.

FactVerify
Source: factverify.com
Key Evidence
Legal standards require probable cause for arrest, not race alone.
Multiple authoritative sources confirm racial disparities in arrest rates but do not support the legality of arresting someone solely based on race.
naacp.orgnaacp.orgCriminal Justice Fact Sheet
sentencingproject.orgsentencingproject.orgReport to the United Nations on Racial Disparities in the U.S. Criminal Justice...
Constitutional protections prohibit such discriminatory arrests.
What the Evidence Shows
The claim that a person can be arrested just for being Black in America implies that race alone is a legal basis for arrest. U.S. Law prohibits arrests based solely on race, as this would violate constitutional protections under the Equal Protection Clause of the Fourteenth Amendment and the Fourth Amendment's protection against unreasonable searches and seizures. While data and research show that Black Americans are disproportionately more likely to be arrested compared to white Americans,naacp.orgnaacp.orgCriminal Justice Fact Sheet
sentencingproject.orgsentencingproject.orgReport to the United Nations on Racial Disparities in the U.S. Criminal Justice... this disparity reflects systemic racial biases and inequalities in policing and criminal justice rather than lawful arrests based solely on race.
Arrests must be supported by probable cause related to suspected criminal activity, not racial identity. The existence of racial disparities in arrest rates does not equate to legal permissibility of arresting someone just for their race; rather, it highlights issues of racial profiling and systemic bias that are subject to legal challenge and reform efforts.aclunc.orgaclunc.orgKnow Your Rights: Police Interactions for Black and Brown People
Therefore, while racial bias affects policing outcomes, the claim that one can be legally arrested solely for being Black is inaccurate.