If one memory can be inherited, who is allowed to use it in court?

In my setting, a dying person can tranfer one memory to an heir. The heir experiences it in first person, including fear and sensations, but can't distinguish details the original misunderstood.

Courts first treated inherited memories like recordings. That became messy: heirs can be traumatised, families sell memories, and two descendents inherit conflicting versions. A murder victim could testify, but without cross-examination.

I'm considering a rule that inherited memories are admissible only if the transfer was registered before death. Would that feel too bureaucratic for the premise? What legal safeguards would develop around “memory inheritance”?