Legal analysis: if there is conclusive evidence, you can't guess out of thin air. The police can't rely on speculation to handle a case. If individual policemen are suspected of acting as black umbrellas, they can report the situation to their leaders in charge or to their discipline inspection and supervision departments.

Legal basis: Article 2 of the Criminal Law of People's Republic of China (PRC) * * * The task of People's Republic of China (PRC) Criminal Law is to fight against all criminal acts with penalties, safeguard national security, people's democratic dictatorship and socialist system, protect state-owned property and property collectively owned by working people, protect citizens' private property, protect citizens' personal rights, democratic rights and other rights, and safeguard social and economic order and socialism.