[blueskin_]

Sadly no, because it would legally be considered killing them. As it is, when you're dying, you get what's called a standby where you have a team waiting by your bedside with a doctor, then they get to work as soon as death is pronounced. Generally, perfusion (replacement of blood with cryoprotectants) can be started in situ within 15 minutes or so, while cardiopulmonary support is provided via a machine from in many cases seconds after legal death. It isn't perfect, but it's the best that can be done in the current legal climate.

It might happen in the future in a decent state/country with good assisted suicide laws (if there was a Swiss cryonics organisation, they would probably be able to offer it). Perhaps in the US it will eventually become possible in Oregon/Washington (edit: also Montana, Vermont, and New Mexico), which allow assisted suicide. Alcor are based in Arizona, so they could have patients get themselves preserved in New Mexico, then be driven to Alcor.