Porter and Whiteside both said that raises questions about police officers' ability to justify marijuana-related arrests. Predicating arrests and prosecutions on someone possessing a "leafy green substance" or smelling like marijuana may no longer be enough if low-THC hemp can be legally possessed, they said.

Gwinnett County District Attorney Danny Porter at a court hearing on Thursday, May 9, 2019. HYOSUB SHIN / HSHIN@AJC.COM

And the tests most readily available to local law enforcement determine only if THC is present, not the quantity of THC that’s present. And that makes it all but impossible to differentiate marijuana from hemp, they said.

"Marijuana is still illegal," said Porter, a longtime Republican who has considered running for re-election as a Democrat. "But the case can't be proved in court right now."

Others found more nuanced phrasing, but acknowledged the potential complications.

“It’s just that prosecutors will have to prove an additional element (of evidence) if an argument is made that industrial hemp somehow prevents enforcement of the criminal marijuana law,” said state Rep. Chuck Efstration, R-Dacula.

Pete Skandalakis, executive director of the Prosecuting Attorneys’ Council of Georgia, said the Hemp Farming Bill makes prosecuting marijuana cases “difficult but not impossible.” He said his agency has been aware of the potential complications and had previously suggested language addressing them be included in the bill.

The PAC is in conversations with state officials to find a remedy to the situation, whether through a legislative fix or new field testing, he said.

The council is currently advising prosecutors and law enforcement officers to consider each marijuana case individually.

“Our advice is to do what they typically do on a day-to-day basis,” Skandalakis said, “which is deal with each case on a case-by-case analysis, see what evidence you have and go forward with those cases you can make out.”

GBI spokeswoman Nelly Miles said decisions will be left to officers and prosecutors, but that the agency believes marijuana cases “remain prosecutable.”

She did not comment on other officials’ suggestions that the GBI was working on developing a new, more widely available field test to determine THC levels.

The governor’s office declined to comment.

The Attorney General’s office said Thursday it had not received a request for a formal advisory opinion to resolve questions about the law.

Georgia Gov. Brian Kemp. Bob Andres / bandres@ajc.com

In Gwinnett, solicitor general Whiteside issued a memo Wednesday declaring his office would no longer prosecute misdemeanor marijuana cases. He said he dismissed more than 100 cases on Wednesday and was working on more Thursday.

“We could’ve kept it under wraps, but then it would’ve been an abuse of power and it would’ve been unethical,” Whiteside, a Democrat and former police officer, said. “If it was up to me we would’ve continued prosecuting it. But it’s not up to me. It’s up to us being moral and fair.”

Whiteside, Porter and local police chiefs are scheduled to have a meeting Friday morning to develop a consensus about how to move forward. A spokesman for the Gwinnett County Police Department, which serves the majority of the county, said the agency is also continuing to research the issue.

“While this research is ongoing, GCPD will issue citations for misdemeanor amounts of marijuana rather than make custodial arrests; this temporary measure will be reassessed as needed,” Cpl. Jake Smith wrote in an email.