bad actor

A person, animal, or element that is unreliable, unruly, and prone to troublesome or quarrelsome behavior. The class was full of bad actors, always fighting and causing trouble. The neighbors have quite a bad actor for a dog—it's constantly trying to fight with our dogs. A number of bad actors in the financial sector have been exploiting loopholes in the rules, making it much harder for those of us who do business legitimately.

crisis actor

1. Someone who portrays a victim in a training drill for emergency personnel, such as firefighters and EMTs. I volunteered to be a crisis actor at my local hospital's disaster drill. You're lucky this is a crisis actor, and you didn't just kill an actual patient, Fleming! If you don't mind spending an afternoon being a crisis actor, they need volunteers to train the new crop of EMTs.

2. conspiracy theory Someone who impersonates a victim of a tragic incident, typically a mass shooting, that has been staged. The concept originated with conspiracy theorists who claim that such actors are employed by governments or secret organizations attempting to stage such incidents to gain support for a particular agenda. The term gained widespread attention when some survivors of the February 2018 mass shooting at Marjory Stoneman Douglas High School in Parkland, Florida, were claimed to be crisis actors by conspiracy theorists in the aftermath of the shooting. Can you believe that some people think the Parkland kids were crisis actors paid to be there to further the liberal agenda on gun control? How sick is that? How do you think people who survived the Boston Marathon bombing feel about talk of crisis actors being there?

no (person) worth their salt would (do something)

No person who warrants respect in a certain field or profession would engage in such bad behavior or activity. No professor worth their salt would remove a student from class just for asking controversial questions. It's baffling—no doctor worth their salt would have missed such an obvious diagnosis.

no teacher/actor, etc. worth their salt

COMMON If you say, for example, that no teacher worth their salt or no actor worth their salt would do a particular thing, you mean that no teacher or actor who was good at their job would consider doing that thing. No racing driver worth his salt gets too sentimental about his cars. No player worth his salt wants to play in the lower divisions. Note: Instead of no, you can use any or every with this expression. For example, if you say that any teacher worth their salt would do a particular thing, you mean that any teacher who was good at their job would do that thing. Any policeman worth his salt would have made proper checks to find out exactly who this man was. Every teacher worth their salt will learn as much from their students as their students learn from them. Note: In the past, salt was expensive and rare. Roman soldiers were paid a `salarium' or salt money, so they could buy salt and stay healthy.