The phrase "an extensive security" is not correct as it lacks a noun to complete the idea.
You can use it when referring to a broad or comprehensive security measure, but it needs to be followed by a noun, such as "system" or "protocol."
Example: "The company has implemented an extensive security system to protect its data."
Alternatives: "a comprehensive security" or "a thorough security".
It also has an extensive security camera system.
At the same time, the Diem government undertook an extensive security campaign called the Strategic Hamlet Program.
Few people in the street were willing to speak to the Guardian, owing to an extensive security apparatus which includes CCTV and informants.
SecureDrop was given an extensive security audit by a team of cryptographers in July 2013, and updated in response to many of the concerns raised at the time.
On Friday, Planned Parenthood said all of its staff at the clinic – which is equipped with "safe rooms" and an extensive security system – were safe and that it did not know the circumstances or motives behind the attack.
Some analysts contend that security problems in Mexico would make it difficult for Mr. Calderón to stay, despite the government's provision of an extensive security detail for former presidents.
And the firm has a long-held view that the individual pieces — an industry-leading investment bank, an extensive securities trading operation and an asset management arm — function best together.
"There is a very, very, extensive security and intelligence presence everywhere in Aleppo and they crack down on any protest as soon as it starts," he said.
Dressed in a white suit, she escorted a journalist through the extensive security of the official hotel of the International Olympic Committee yesterday.
On Monday, Andrew M. Genser, an assistant United States attorney, said in Federal District Court in Brooklyn that Mr. Watts had hidden several guns around the estate as a "feature of the extensive security provisions he had made".
The rampage Thursday night at a packed Bastille Day fireworks celebration in the southeastern city of Nice, which unfolded as the assailant used the rented refrigerated truck as a battering ram, was all the more unnerving because it came as a total surprise despite extensive security precautions, French officials acknowledged.
