I would've thought so too 'til this thread got me reading. But, no -- no matter where you are -- in your own home and on your own land you can still today do pretty much anything you please with a loved one's body. Most people don't think about this because we're conditioned to think of using a funeral home, and because it's really only practical for people who have a large chunk of family land. If you live on a typical one-acre lot and will eventually sell your house, burying someone out back isn't a realistic idea for several obvious reasons.I'm not sure where you live, but I'm pretty sure this is illegal/against health code violations in most of the country.
Also, people tend to have public viewings in churches and funeral homes, and IF you have such a viewing in a public place, the body must be embalmed. In your own home, you can wash the body yourself, lay it on dry ice and keep it for a couple days, and bring in who ever wants to come for a viewing.
Churches and public cemeteries have rules about embalming, caskets and vaults -- but they aren't public laws.
What is the law:
You must have official death certificates, and you must inform certain government agencies of the death.
If you bury on private land, you must have health officials say that it's an acceptable spot -- I saw concerns with the water supply mentioned several times.
I doubt this is valuable information for the majority of us -- and it has nothing to do with the OP's situation -- but it's an example of just how we've come to think of certain services as mandatory, when actually we do have choices. I find it an interesting topic.