(a) Venue Established. Every offense shall be prosecuted in the county or judicial district in which it was committed. If part of an offense is committed in one county, and part in another, the offense may be prosecuted in either county.
(b) Change of Venue. If a court finds that a fair and impartial trial cannot be had in a county or judicial district in which the offense was committed, it may, upon the motion of the defendant, transfer the case to another county or judicial district where a fair and impartial trial may be had.