That is DEFINETLY not how it is done here. I mean that kindly as well.
Different states have different laws.
For example, if a paramedic told you to connect that syringe filled with whatever med, and push it because their hands are busy intubating - it falls on their license. Not the person who pushed it.
In my state, I can speak for because I've seen lawsuits happen both in hospital and in pre-hospital. If a task is delegated by a professional licensee, they are responsible for anything that happens with their delegated task. It may not be that way in your state, but it is here.
I know this due to years of working in public safety. We had a firefighter who was in EMT school that was at the YMCA. The medic told the EMT student to draw up Epi and push it at a code. The EMT student (who was not licensed) drew up Adenosine during the code. The pt ultimately died. Who was at fault and held responsible? The medic. Why? They were the LICENSED provider who DELEGATED the task and did not validate what was happening.
And unfortunately if you go into a hospital anywhere in this area and request a scope of practice or what you can and cannot do - they say "just do what the RN tells you to". So even as a NA, they had me removing IVs and adjusting oxygen levels due to my EMS courses I took. It wasn't allowed for any other NA on that floor but me, because there's that "trust" they had. And even as my MSN unit director said, legally there's nothing that could happen to me, but could fall back on the licensee for delegating the task and not supervising per the "span of control". There's a reason why older RNs around here refuse to let PCTs do anything with their pt, because they are scared of it coming back on them.
As far as 12-leads, an RN cannot legally bill for that. Only a clinician can (MD, cardiologist, etc...) but PCTs can interpret them. I have experience doing such as a monitor tech and working in EMS. Again - not being rude but my state does not recognize the PCT, so they fall under the nurses license whereas CNA/NA's do have a scope, and must strictly adhere to it. This isn't my first rodeo and I'm sorry if your state and region has stuff that's black and white - we don't yet were one of the largest cities with the most advanced Healthcare in the US.