A more thorough explanation:

The chain-of-causation rule is a principle in workers' compensation that states that if an employee suffers a work-related injury that leads to a mental disorder resulting in suicide, then the suicide is compensable under workers'-compensation statutes.

For example, if an employee falls from a ladder at work and suffers a traumatic brain injury that leads to depression and ultimately suicide, the chain-of-causation rule would apply, and the employee's family would be eligible for workers' compensation benefits.

The chain of custody refers to the movement and location of real evidence, and the history of those persons who had it in their custody, from the time it is obtained to the time it is presented in court.

For example, if a murder weapon is found at a crime scene, the chain of custody would document who found the weapon, who collected it, who transported it to the lab for analysis, and who stored it until it was presented in court as evidence.

The chain of custody is important because it ensures that the evidence presented in court is authentic and has not been tampered with or altered in any way. It requires testimony from each person who had possession of the evidence, and they must confirm that the evidence remained in substantially the same condition during their possession.