Is concentrated cannabis legal?

Concentrated THC extract from cannabis (known as hash/hashish) is widely illegal, and is not available to purchase medically even if you have a green card. Thick or dank nuggets of marijuana are available from medical dispensaries, but THC in its most concentrated form is still presented to be illegal; if you have a green card and are legally allowed to smoke marijuana and would like to purchase hash from a local dealer, unless they tested the substance you are smoking they could not differentiate hash from weed, nor would they bother checking. If you are an illegal and already smoke marijuana, you might as well go smoke hash because both are illegal. Thats all I got for ya.