If you are collecting a accidental disability retirement because of a work related injury as a police officer is this taxable income?

The question does not revolve around the employment as much as:

If the payment is under a policy that you contributed premium to (on an after tax basis)...and how much. If you paid for the policy, generally, at least to the amount you paid as a percentage of premium, the benefits are not taxable.

Also, if the payment is for loss of something like an arm, eyesight, etc. - as it is replacing something you "owned", it generally is not taxable. if it is for income that you would have received (and been taxable when it was received), then generally, it is taxable.

your plan administrator can tell you about your specific coverage and benefit.