As someone who used to be a cop, this is absolute peak cops justifying the evidence not supporting their intuition by just making bullshit up.
If it actually worked, they'd have data and results. But, spoilers, they don't.
If it actually worked, they'd have data and results. But, spoilers, they don't.
Seems like it's a useful prop for manipulating people, and in that role it really is effective.
Similar to e-meters in Scientology.