Sec. 35.10  Justification; use of physical force generally.
    The  use  of  physical  force upon another person which would
otherwise constitute an offense is justifiable and  not  criminal
under any of the following circumstances:
    1.   A  parent,  guardian  or other person entrusted with the
care and supervision of a person under the age of  twenty-one  or
an  incompetent  person,  and a teacher or other person entrusted
with the care and supervision  of  a  person  under  the  age  of
twenty-one for a special purpose, may use physical force, but not
deadly physical force, upon such  person when and to  the  extent
that  he  reasonably believes it necessary to maintain discipline
or to promote the welfare of such person.
    2.   A  warden or other authorized official of a jail, prison
or correctional institution may, in order to maintain  order  and
discipline,  use  such  physical  force  as  is authorized by the
correction law.
    3.   A  person  responsible for the maintenance of order in a
common carrier of  passengers,  or  a  person  acting  under  his
direction,  may use physical force when and to the extent that he
reasonably believes it necessary to maintain order,  but  he  may
use  deadly  physical  force  only when he reasonably believes it
necessary to prevent death or serious physical injury.
    4.   A  person  acting under a reasonable belief that another
person is about to commit suicide or to inflict serious  physical
injury  upon  himself  may use physical force upon such person to
the extent that he reasonably believes  it  necessary  to  thwart
such result.
    5.   A  duly licensed physician, or a person acting under his
direction,  may  use  physical   force   for   the   purpose   of
administering  a recognized form of treatment which he reasonably
believes to be adapted to promoting the physical or mental health
of  the  patient  if  (a)  the treatment is administered with the
consent of the patient or, if the patient is  under  the  age  of
eighteen  years or an incompetent person, with the consent of his
parent, guardian or other person  entrusted  with  his  care  and
supervision, or (b) the treatment is administered in an emergency
when the physician reasonably believes that no one  competent  to
consent can be consulted and that a reasonable person, wishing to
safeguard the welfare of the patient, would consent.
    6.   A person may, pursuant to the ensuing provisions of this
article, use physical force upon another  person  in  defense  of
himself or a third person, or in defense of premises, or in order
to prevent larceny of or criminal mischief  to  property,  or  in
order  to  effect  an  arrest  or prevent an escape from custody.
Whenever a person is authorized by  any  such  provision  to  use
deadly   physical   force  in  any  given  circumstance,  nothing
contained in any other such provision may be deemed to negate  or
qualify such authorization.
.

(For verification consult Official Text at Senate Gopher site.)