For the most part, first responders are already trained. They are professionals, so would they need a little extra training? In my opinion, it could be quite quick.
I can tell you that, from my own personal experience, it is quite a simple exercise. We even established first responder training for people with a handicap or a challenge. A 10-year-old child can go through the drill; you just have to take the device, open it and put it on the patient's chest. The device gives you all the information you need and tells you what to do.
I invite you to ask someone to come to give you a demonstration. It would be a very good idea for an expert to come and show committee members how the device works. You would see that it is something quite simple.
Before anyone asks, I have calculated how much it would cost. According to my data, which perhaps are not the most up-to-date, it would cost $8 million at most to equip all emergency vehicles and finish the work started by a number of services across the country. When I look at the budget of the federal government, I do not consider that to be an astronomical expense.