Unless you have access to the co-workers medical records you do not know that the situation is the same.
If the Statute has run you have no recourse.
If you want to know why your husband cannot work and the co-worker can, ask HR. They are the only people who know. We are only guessing.
We do have the co-workers medical record, he gave it to us. It is the same; no prolonged sitting or standing, no heavy lifting or climbing. They both drive dump trucks and have a lot of freedom as to how they can manage their time (government job!). We have asked HR and the ONLY reply is "this is what we require"... no elaboration, no explanation, no mediation. If you read my previous post, you'll see the only difference between my husband and his co-worker is the father of the co-worker is a county commissioner who happens to be one of five of the bosses for the county road department. Now, could this be perceived to be favoritism... discrimination... any ideas?