(725 ILCS 235/8)
(from Ch. 38, par. 157-8)
from arrest and service of process.
If a witness from another state comes into or passes through this state
under an order directing him to attend and testify in this or another
state, he shall not while in this state pursuant to the order be subject to
arrest or the service of process, civil or criminal, because of any act
committed prior to his arrival in this state under the order.
(Source: Laws 1963, p. 2171