12    
   
   
 

So, what is a black strike, anyway?
 

When there is a criminal trial and the jury is being selected the lawyers for both sides get to use “peremptory challenges” to say that they do not want  a particular juror. 
This can be done when the juror is first selected or once there are twelve potential jurors and the lawyers can see the mix of people on the jury (this is known as Back Striking).