A PC is someone who can't survive in the mainline population among other pisoners for various reasons. The prisoner could be a child molester, rapist, a snitch, or has an enemy or owes others money. When a prisoner fears for his or her safety, he or she can volunteer to go. PC up. It means the prisoner goes to the administration and requests to go to solitary confinement where no one can touch him or her.
There are many drug addicts in prison who can't kick their habit. They will look for ways to get their hands on drugs. Despite the tight security of prison, drugs are prevalent in the system. YOu can almost buy the drug of your choice if you have the money.
Many addicts are dope fiends. They don't have money to buy drugs, but they can't do without. In desperate moments, they pull a PC move. They get their drugs on credit from different drug dealers. Sometimes they can ring up the drug debt to $2,000 to $3,000. Then they go PC up so that they don't have to pay the bills. Many drug dealers fall for that trick.
That's just one of the many PC moves.