Federal legislation last year removed hemp from the list of federally controlled substances and now treats the low-THC version of the cannabis plant like other agricultural crops. But existing Ohio law doesn't differentiate between marijuana and hemp. The newly passed Ohio legislation would allow for cultivation of hemp as long as it contains less than 0.3% THC, the cannabis compound that gives marijuana its high. It would be regulated by the state. The measure was sent to GOP Gov. Mike DeWine for consideration. It would take effect immediately if he signs it.