Liquid culture? You mean like in a syringe? Relax. Those are for microscopy only. Just don't let the cops find your grain bags with injection ports.
Not really. Syringes may contain spores which, according to general understanding and various state laws contain zero psychoactive.
Tissue culture is, effectively, liquid culture. It has actually mycelium in it. Mycelium contains active alkalosis, at times significant amounts.
Technically, such tissue is illegal as there is no minimum amount of your preferred chemical that would be legal.
I suspect that eventually, the feds if not the individual states or both, will crack down on tissue vendors.
There are always loopholes opening and closing in the drug world.
Many MANY years ago, we could purchase "decocanated" coca leaves.
Well, they weren't, and for five dollars one could purchase enough leaves for a dozen mildly intoxicating and rather pleasant tasting cups of coca tea.
And then, we could purchase poppies from ebay, about $100 could get you 20 cups worth of very affective doses of opium.
And now we can still get very effective lsd analogs that are indistinguishable from the real thing (to the uninitiated...i waa rather disappointed actually).
Tissue culture WILL Be discovered and halted. If you can get some, do so and preserve it while you can.