Not to familiar with the laws of the US. But it was my understanding that the only place it is mandatory to treat someone was Quebec. Here I Alberta it's not mandatory, by the law. My own ethics wouldn't allow me not to help. As for the danger of getting sued. Getting sued and loosing are 2 things. If you can prove you acted in the benefits of the other person interest and in the limit of your knowledge. Now there a note on that subject. Health care professional, beside if your a MD, outside work you are at the same level as a first aid person. For example as a flight nurse I can intubate, because I have medical direction to do so. Without my flight suit I can intubate " i have the knowledge" but I doubt I would be protected.


As for the tourniquet debate. What the recommend now is:
direct pressure ( no more use of pressure point) and compressing dressing
if still bleed, you can use hemostatic agent ( ex: quick clot)
if bleed continue you can applied a tourniquet. Leave if your less then 2 hour from facility, there amputation or been on more then 6 hours

If it will take more then 2 hours to get to facility
get ready to applied direct pressure and have a hemostatic product ready.
slowly release tension. if you can't manage the bleeding reapplied. LIfe over limb in that case.