The atmosphere is majority nitrogen. You can buy a nitrogen distiller from China for about 1k and make as much as you want.
In that case, sounds like all the death penalty states need one!
“Your honor, my client requests a stay of execution, until we have received the requested independent test reports proving that this Chinese distiller will produce nitrogen at the purity the state requires. Also we request a stay pending import/export compliance reports on the manufacturer as well as its seventeen suppliers. Upon conclusion of these investigations, we will of course need twelve years of animal testing (to begin once the PETA lawsuits are concluded).”