Tex. Health & Safety Code § 258.002

For purposes of this chapter, "mandatory overtime" means a requirement that a nurse work hours or days that are in addition to the hours or days scheduled, regardless of the length of a scheduled shift or the number of scheduled shifts each week. In determining whether work is mandatory overtime, prescheduled on-call time or time immediately before or after a scheduled shift necessary to document or communicate patient status to ensure patient safety is not included.