1. A person may be prosecuted for conspiracy in the county in which he entered into such conspiracy or in any county in which an overt act in furtherance thereof was committed.

2. An agreement made within this state to engage in or cause the performance of conduct in another jurisdiction is punishable herein as a conspiracy only when such conduct would constitute a crime both under the laws of this state if performed herein and under the laws of the other jurisdiction if performed therein.

3. An agreement made in another jurisdiction to engage in or cause the performance of conduct within this state, which would constitute a crime herein, is punishable herein only when an overt act in furtherance of such conspiracy is committed within this state. Under such circumstances, it is no defense to a prosecution for conspiracy that the conduct which is the objective of the conspiracy would not constitute a crime under the laws of the other jurisdiction if performed therein.