Qualified immunity will likely be your defense if you face a federal civil rights case for illegal search and seizure under the Fourth Amendment. But remember, ignorance of the law is no excuse. If you detain someone and there is clearly established case law that you shouldn’t have done it, then you have failed the qualified immunity test. And it doesn’t matter that you didn’t know the law because the jury will decide that you should have known. After all, as a law enforcement officer, it is your duty to know the law.
It’s also important that you understand the difference between departmental policy and the law.
Much of the time if you know your agency’s policy and follow it, then your actions will be lawful. This is especially true if your agency is very proactive in adapting its policies to follow case law. However, just because you followed departmental policy, that does not mean that your actions were lawful.
And the reverse is true as well. “Just because an officer’s actions were outside of policy does not mean that he or she can’t avail him or herself of qualified immunity as a defense,” says Lance Tyler, Atlanta-based attorney for the International Brotherhood of Police Officers.
Of course, as noted, qualified immunity is often decided by a jury, and juries can get confused between policy violations and what constitutes a violation of law by an officer. In other words, if you violate policy, it could influence the jury’s decision.