LOS ANGELES — Jerred Kiloh’s eyes narrowed as he checked his mirror again. The black Chevy SUV with tinted windows was still behind him.

It had been hanging off Kiloh’s bumper ever since he nosed out of the parking lot behind his medical-marijuana dispensary with $40,131.88 in cash in the trunk of his hatchback.

Kiloh was unarmed, on his way to City Hall to make a monthly tax payment, and he was afraid of one thing above all else: getting robbed.

That fear is a constant part of doing business in California's flourishing medical cannabis industry, in which transactions are conducted mostly in cash, sometimes in stunningly large amounts.

“The thing I need the least right now is to have to go through any sort of money disappearing,” Kiloh said.

On Jan. 1, recreational pot will become legal in California, creating what could be the world’s largest legitimate marijuana economy. It comes more than two decades after the state gave its blessing to medical cannabis.

But the emerging marketplace with a projected $7 billion value has a potentially crippling flaw: Banks don’t want the risks of doing business with companies whose product remains illegal under federal law.

So while the sneaker shop next door can send a check to City Hall to cover its taxes, or wire the money from a laptop, Kiloh has to make a stress-filled, 15-mile freeway drive each month to downtown Los Angeles.

The state expects to collect $1 billion in new tax revenue annually from pot within a few years. In LA — estimated to have anywhere from 1,000 to 1,700 medical marijuana dispensaries, only about 200 of which paid city taxes in 2016 — the take is projected at $50 million next year alone.

However, governments will almost certainly miss out on money without an easy, secure way for businesses to pay. With no bank records, it will be harder for regulators to track funds and identify shady operators. And those who operate by the book will be undercut by those who don’t.

Without banks, “everyone loses,” said Nicole Howell Neubert, a marijuana industry lawyer.

Kiloh, a 40-year-old with a graying mohawk and a degree in economics, has 15 years in the pot industry as a seller and cultivator and is a partner and business manager at a San Francisco dispensary and the owner of the one in Los Angeles.

In the absence of a bank, Kiloh has become his own. Twist and turn through a warren of rooms inside his shop, go through a door with a keypad lock, and you will come to a closet-like space that contains twin steel vaults, standing head-high. The walls around them are reinforced with steel.

Overhead, more than 50 cameras scan his offices and hallways and keep watch outside the building as well. An armed guard stands at the door to the sales floor.

With all the cash on hand — Kiloh grossed $4 million last year — crime is a gnawing fear. His dispensary has been robbed twice.

The Los Angeles Police Department did not immediately respond to a request for statistics on crimes against marijuana dispensaries, and many cases are believed to go unreported anyway, since many businesses are loath to go to the police.

Last year, though, a dispensary owner shot and wounded two armed men during a holdup in the Los Angeles suburbs. And a security guard at a dispensary was killed in an attempted robbery in Aurora, Colo., another one of the nine states to legalize recreational pot.

To keep criminals guessing, Kiloh avoids arriving at the same time each day and staggers the times he leaves. He goes in and out of different doors. He keeps an eye on cars parked around his shop.

Once a month, Kiloh telephones to make arrangements to drop off his tax payment at the city Finance Department, which gets 6 percent of his gross revenue. They want to know he’s coming — it’s dangerous for them, too.

His journey to the tax office starts at a windowless back room at his shop, where stacks of $20 bills flip through the counting machine at his desk.

He and his staff then wrap the bills into neat $2,000 bundles and wedge them into a long cardboard box, which is then covered in plain paper and stuffed into a shoulder bag that goes into the trunk. From the moment he pulls out of his parking lot, he is watching, assessing.

“I find myself looking in my rear-view mirror hundreds of more times than I usually would in just normal traffic,” Kiloh said.

“That’s what a lot of this industry has been about: Just stay under the radar, and that’s your best defense.”

It was on Kiloh’s drive to City Hall in late June that he noticed the Chevy.

Eventually, the Chevy disappeared, but Kiloh wasn’t home free yet.

Once inside a garage, he looped around until he found a spot near a stairwell. Lifting his satchel from his trunk, he scurried toward the door.

Finally at the granite-faced tower, Kiloh darted up the steps and slipped behind a pair of glass-and-wood doors. He emerged about 20 minutes later, his tax bill paid, and drew in a slow, deep breath.