A decision is a statement that makes the CPU compare two or more values in a TRUE-or-FALSE way. Once a decision is evaluated, it usually leads to control being diverted to a different part of the program.
The decision is generally called the "verdict." Once the verdict is delivered, if the person was found guilty, it leads to the sentencing phase of the procedure, where the judge rules on the appropriate punishment.
Yes, Justin Bieber did gueststar on CSI. He played a role of Jason McCann a troubled teen who faced with a terrible decision regarding his only brother (Alex McCann), a decision that leads him into an explosive confrontation with the CSIs.