The phrase "adjacent security" is correct and usable in written English.
It can be used in contexts where you are referring to security measures or systems that are next to or in close proximity to one another.
Example: "The adjacent security systems worked in tandem to provide comprehensive protection for the facility."
Alternatives: "neighboring security" or "contiguous security".
At Wallkill, amid meadows strewn with clover and dandelion and the looming guard tower of the Shawangunk Correctional Facility, an adjacent maximum-security prison, men who had never seen a horse now feed and wash Quick Call, a well-mannered Saratoga favorite who won at least one race two hours north of Wallkill every year from 1987 through 1990.
The soldiers "killed innocent people" in the village adjacent to a security post of the Pakistani Frontier Corps.
Only performers were allowed in the adjacent strip; for security reasons, Border Patrol kept the audience behind the second fence.
In Idlib, a homemaker living in a residential neighborhood adjacent to the security headquarters said in a telephone interview that just after dawn prayers she heard a loud blast and her building started to shake, damaging some windows and scaring her four children.
In contrast, the Administrative Maximum U.S. Penitentiary in Florence, Colo., the federal system's most secure lockup, is adjacent to a minimum-security camp.
Besides, Mr. Senor said, California is building a maximum security prison adjacent to San Quentin that costs $220,000 a bed.
The white security tent adjacent to the pier stood empty, while five officers of the United States Park Police sat idle in their vehicles nearby.
The fighting between the army and the Taliban in Hangu was more serious than an effort by paramilitary forces last month to clear non-Taliban militants from an area of Khyber, a pocket of the tribal region adjacent to Peshawar, where security has collapsed and there is a general fear of the Taliban.
(Again, Mobileye with its in-car self-driving technology seems like a ripe opportunity for developing adjacent and integrated automotive security solutions).
The Snowden chat meandered over a broad swath of security-adjacent topics, as Snowden interviews are wont to do.
