Massachusetts State Police will transport your friend to a State Police barracks for processing. The same rights apply: silence and counsel. State police often have direct lines to federal immigration, so a lawyer should be involved at the earliest opportunity. Attorney Rory Munns can check if an immigration detainer has been filed and start negotiating. Your friend should not discuss their immigration status with police. Call 401-573-2265 to reach a lawyer who handles both criminal and immigration consequences.