One of our high school friends from decades ago, went to school to become a lawyer. Early in his career he had a client to defend. He told the defendant to dress very very nice, with suit and tie polished shows etc.
The lawyer went to court in regular shabby street clothes. When the prosecutor told the Police Officer to identify, or point at the accused, the cop pointed at the lawyer.
Naturally the judge got angry and reamed out the lawyer for pulling such a dirty trick that worked.
Around here they have been sending out fake buyers and renters to entrap race housing discrimination. (just another money grab) White testers, and people of color testers to document violations they are mining for.
If they told the White testers to show up in front of a landlord, or real estate broker with shabby clothes and an old beat up car that borders on junk, the White people would be discriminated against. “Oh sorry it’s already been taken”
If they told the people of color testers, to dress perfectly, and drive up in newer polished expensive looking cars, or SUVs, even if they have to rent one, they would be treated very respectively get preferential treatment.