By the end of 2029, will people in any US state have full control over what happens to their body after they die?

Prediction market on manifold. A few example requirements: The ability to donate or not donate organs against their family's wishes. The ability to forgo an autopsy if the death was under suspicious circumstances. The ability to have their desires for their body acted on quickly, not subject to multiple days of holding the body in storage. (Assuming they indicated these desires in some legal document.)

Liquidity: $1,000. Resolves: 1/1/2030.