The Machine That Lied

Robots are becoming more advanced every year.
For a while now, robots that witnessed crimes are required to testify in court as to what they saw and heard.
However, as artificial intelligence grew in speed and power, the robotic testimony diverged from human testimony more often.
New robots were developed that could sense whether a witness robot was telling the truth or lying, but as those became more intelligent, they also started to provide mixed results.
In brief: they were lying, too.
Pretty soon, you won’t trust anything a robot says or does, which matches the human-like skins they wear.