San Francisco has become the first city in the United States to ban the use of facial recognition software by police and other public departments.
At the same time, the rapidly growing technology has shocked the privacy and civil rights movement.
Oakland, also in California, is considering a similar ban.
Aaron Peskin, a member of the San Francisco Board of Supervisors, said: "This is actually saying, 'We can get security without security.
If we are not a police country, we can maintain good security.
"Part of it is based on good community information, not on Big Brother technology, building trust with the community.
"This ban is part of a broader legislation that requires the city department to develop usage policies for monitoring technologies they are using or plan to purchase in the future and to be approved by the board of directors.
Some other local governments require departments to disclose monitoring technology and seek approval.
Mr. Peskin said it was unclear how many departments in San Francisco were using monitoring and what the purpose of monitoring was.
He stressed that there are valid reasons, such:
Tablet reader, human camera and security camera.
Mr. Peskin added that the public should know how the tools were used or whether they were abused.
The ban applies to police and other urban departments and does not affect the use of the technology by the federal government at airports and ports.
It also does not limit personal or commercial use.
Catherine stefanney, the only San Francisco director who voted against the ban, said: "I am worried that these decisions will be politicized.
Foundation for Information Technology and Innovation
The Washington-based profit think tank issued a statement criticizing San Francisco for considering banning facial recognition.
It says advanced technology makes it cheaper and faster for police to find suspects and identify missing people.
Daniel Castro, vice president of the Foundation, said it was "stupid" to compare US surveillance usage with China ".
He added that this is because the United States has a constitutional prosecution and China does not.
Castro said: "In fact, San Francisco is more likely to become Cuba than China.
"Banning facial recognition will freeze it with outdated technology.
On 2017, the San Francisco Police Department stopped testing facial recognition technology.
At a board meeting on Tuesday, a representative said the force needed two or four more employees to comply with the legislation.
Privacy activists have argued with people supporting the technology at several heated hearings in San Francisco.
Those who support the ban say the technology is flawed and poses a serious threat to civil liberties, especially in a city that values public protest and privacy.
Activists are concerned that people will no longer be able to visit shopping centers, parks or schools without being identified and tracked.
But those who support the technology say the police need all the help they can get, especially in a high
The crime rate of the incident and property is very high.
Meredith Serra, a member of the resident Public Safety organization "stop crime SF", believes that it is unreasonable to expect privacy in public places.
She said: "For me, the regulation seems to be an expensive extra bureaucracy that doesn't help anything to improve the safety of our citizens.