It would depend on the medication and what you're taking the medication for.
If both the issue (the reason you're on medication) and the medication (it self) do not affect your ability to handle basic tasks like driving, running, and the other necessities it takes to be a police officer, then a police department would be more than willing to consider you.
If either the issue or medication cause issues with these basic tasks, the department may see you as a liability.
These standards are general, and may vary from department to department, as each department sets their own standards.
they can join the police force
There aren't a "Official Police Force" but the players can create room called like that to have fun.
He doesn't
No. A person wishing to join any police force in the world must be at least of adult age in that jurisdiction; this is normally 18 years, but some do differ.
You must have either a Provisional or Full Licence prior to your application to the Police Force.
Well, if YOU can not answer this question by yourself, you have no place in the police force.
None, you can't.
Kiran Bedi
Nope.
Yes you need to pass the P.T. test to be a police officer.
You can't join it although there might be a uniform somewhere
You can't. You can be a good bystander though!