"Where we cannot go, we will now be putting an unmanned aircraft system (UAS). Where we can't see, we can now put a UAS," Richard Fields, battalion chief with the Los Angeles Fire Department, told AFP at a conference on drones this week in Los Angeles.

Fields said his department, one of the first major metropolitan fire departments to have a significant drone program, has deployed the devices in at least 300 incident-related missions since 2017.

"It fills the gap between helicopters in the sky and the boots on the ground," he said of the dozen drones used by his department.

"And it provides us with quick, accurate information that now allows us to make better decisions in deploying resources and mitigating the emergency.

"I no longer have to guess, I see it."

The drones are able to cover large areas in little time, recording video via infrared technology that can help locate "hot spots" in a fire.

They can also zoom in on a license plate a mile (1.6 kilometers) away and greatly reduce the time it takes to locate a suspect or missing person.

Romeo Durscher, director of public safety integration at DJI, the world's leading maker of civilian drones, said the use of the devices has increased six-fold between 2015 and 2018, helping save at least 278 lives worldwide.

"What is really, really awesome about (drones) is it doesn't matter if you're large or small, you can employ the technology regardless," said Todd McNeal, fire chief at Twain Harte, a small rural town located near California's famed Yosemite National Park, where drones have been used to help combat wildfires.

McNeal noted that a commercial drone costs about $50 an hour to operate as opposed to $1,500 for a helicopter which can be hampered by thick smoke and must return to base to refuel and change crew.

- Vital info in real time -

A drone -- as opposed to a helicopter -- also gives firefighters vital information on how a blaze is unfolding in real time, he added.

McNeal said drones played a key role in 2017 in helping combat a fire in Yosemite.

"We were able to download, in less than an hour, truer data and give (firefighters) bearings, geographic features and lineal distances to heat signatures with causes of concern," he said.

"The whole thing came together perfectly and allowed the group to then target very specifically where the hazards and the risks were."

Police departments are also increasingly relying on drone technology to map crime scenes and respond to specific situations.

That's the case in Alameda County, near San Francisco, where the sheriff's department has a fleet of about 30 drones used on a daily basis.

"We started out with a $120,000 laser scanner about 10 years ago," said Penny Ritter, a criminalist with the sheriff's department.

She said the $120,000 device had cords "that you're dragging through blood and crime scenes" and was linked to a computer that had to be hauled along with a generator.

"The scans were about 40 minutes apiece," she said. "In a typical crime scene we would do about eight scans. So you're out there for hours scanning.

She said a police officer operating a $7,000 drone can map out a crime scene today in 30 to 40 minutes, even in areas filled with debris, including fire-ravaged buildings.

As for using drones equipped with weapons as a tool for law enforcements, experts at the conference in Los Angeles said that was not on the books for now.

Some police departments, however, are already training officers to use drones in active shooter situations or help in a hostage situation.

That was the case last week when a drone was used in Florida during a seven-hour standoff with a man claiming to have a grenade that proved -- thanks to drone footage -- to be fake.

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