Hello there

As you must be knowing because you are asking this question that in all the fields there are some persons who illegally do their duties just in the sake of some amount of money.

Talking specifically about doctors then there are many in the world who are paid by the medical mafia. They do illegal activities by like by prescribing the patients unnecessary tests to any specific centre to which they will be having connection and asking for donations for the patients they sent to that specific Centre for that particular test. And also some will prefer the medicines of that company or organisation which of they would be having connections.

I hope it helps you!

Thank you!