Clive Feather:
Much, if not all, of the US has a "Good Samaritan" law: if you were
genuinely attempting to give help in an emergency, you can't be sued for
the results of your actions.

That's "laws", plural -- this is under state jurisdiction.
http://www.momsteam.com/alpha/features/cardiac_awareness_center/good_samaritan_laws.shtml
has a synopsis of Good Samaritan laws in all 50 states and DC, showing how
they vary. In Canada, http://www.canadianlawsite.com/goodsamaritan.htm
says that rescue attempts are required in Quebec and protected in 4 of the
the other 9 provinces.
--
Mark Brader | But I think we can do better next time. (Where the
Toronto | word "we" refers to [those] who do the hard work while
| I sit back and complain...) -- Keith Thompson

My text in this article is in the public domain.