What are the elements of a conspiracy to commit a crime?

To prove a charge of conspiracy, the prosecution must show: "(1) an agreement between two or more people, (2) who have the specific intent to agree or conspire to commit an offense, (3) the specific intent to commit that offense, and (4) an overt act committed by one or more of the parties to the agreement for the purpose of carrying out the object of the conspiracy." (People v. Vu (2006) 143 Cal.App.4th 1009, 1024.) Circumstantial evidence can be used to prove these elements, and the agreement proved can be a tacit one. (Id. at p. 1025.)