What is the test for a plaintiff to sue a municipality for failing to properly train their police officers?

A plaintiff alleging a failure to train must show that "(1) he was deprived of a constitutional right; (2) the [municipality] had a training policy that 'amounts to deliberate indifference to the [constitutional] rights of the persons' with whom [its employees] are likely to come into contact'; and (3) his constitutional injury would have been avoided had the

[municipality] properly trained those officers." Blankenhorn v. City of Orange, 485 F.3d 463, 484 (9th Cir. 2007).