We actually have a reasonable way to test for human biases in AI - perturb the input a bit and see how the AI responds - For e.g., change the name, change the gender etc. and we use them to measure if AI is fair. It is different question whether all AI can be subject to such tests. For e.g., how will you detect a human bias in a page ranking algorithm? but for where it matters, you can test them and we do test them.