I put some poo into the post box near me today.
Every two years, the NHS sends me a bowel cancel screening programme test kit. I have to take six samples of my poo, using the method they explain, and post it to them. They check it, and tell me if I have bowel cancer. So far, so good.
This is one of the benefits of a healthcare system where the priority is the health of everyone in the country. If the NHS's priority were profit, they wouldn't do this.
Aren't you glad we live in England?
... later ...
Result came back normal.