28 C.F.R. § 301.318
The Inmate Accident Compensation system is not obligated to comply with the provisions of any other system of worker's compensation except where stated in this part. Awards made under the provisions of the Inmate Accident Compensation procedure differ from awards made under civilian workmen's compensation laws in that hospitalization is usually completed prior to the inmate's release from the institution and, except for a three-day waiting period, the inmate receives wages while absent from work. Other factors necessarily must be considered that do not enter into the administration of civilian workmen's compensation laws. As in the case of federal employees who allege they have sustained work-related injuries, the burden of proof lies with the claimant to establish that the claimed impairment is causally related to the claimant's work assignment.
28 C.F.R. § 301.318