Actually yes. Or well sort of. I believe some tax forms even have boxes for illegal income. This is because there is an odd interaction between two very important laws; you must report all income truthfully for tax purposes and you cannot be compelled to incriminate yourself. Tax law cannot overwrite the 5th amendment. This means they have a choice; either they can prosecute anyone they see as having an illegal income but make it so people writing nothing but “I plead the 5th” on all their tax paperwork is perfectly valid. Or they can choose not to prosecute reported criminal income and retain the ability to go after people who refuse to do their taxes. The only way the tax system can work is if reporting your own illegal income doesn’t legally incriminate you.
The things you write on your taxes cannot be used against you in a court of law unless you are lying in some way. So it is legally safe. Practically perhaps not. Both the police and many of the security agencies love using something known as ‘parallel construction’. It’s where they get some information they shouldn’t have access to or shouldn’t be using and build an investigation that explains how they got that information legitimately so they can use it in court.
Typically the major threats from canniblism are bacteria, viruses, fungus, parasites and prions. The bacteria, viruses, fungus and parasites shouldn’t exist under properly maintained lab conditions. But prions are just misfolded proteins. They happen rarely and typically they are quarantined in the cell they were produced in. A number of things have to go very, very wrong for them to get out into your body from your own cells. However, eating and digesting cells can let out the prions they contain. Once they get out they’ll start triggering other proteins to misfold but only if the right materials are present and if the prion came from human tissue you can be sure they are.
The human immune system is incredible, it has impressive countermeasures for almost anything you could think of. Heck it’ll even attack solid objects that get stuck inside you. If you get shot by a bullet and don’t get it removed (not recommended) your body will layer by layer eat that bullet. Slowly dissolving it and passing it into your blood so your kidneys can filter it and you can piss out that bullet over the course of decades. (Though having a bunch more metal in your blood causes its own problems). Your body has a response to just about everything including cancer which to get anywhere has to have some mutations to deceive your immune system.
Your body has no answer to prions whatsoever. Your body puts up no fight. If you are infected by a prion disease you are going to die. There is no vaccine, no cure, no treatment.
Once symptoms appear you’ll have at most a few years if your very lucky but more likely a few months. Most prion diseases attack the brain. (side note; don’t eat the brains of any animal regardless of circumstances)
Will perfectly sterile lab conditions eliminate prions as a concern? No If anything it might be possible that growing the meat artificially might result in more misfolded proteins. I’d still happily eat lab-grown animal meat. But lab-grown human meat? No thank you