The phrase "a breach through which" is correct and usable in written English.
It can be used to describe a gap or opening that allows something to pass through, often in a metaphorical or legal context.
Example: "The investigation revealed a breach through which sensitive information was leaked to unauthorized parties."
Alternatives: "a gap that allows" or "an opening through which".
It is less of a loophole (technical definition: an arrow slit in the wall of a fortress) than a socking great breach through which the Government invites corporate giants to drive a coach and horses.
The terrible blurring of the legislative and executive functions of our politicians is the breach through which Ukip is galloping.
In Target's case, it appears that the initial breach through which black hats secured access to its systems took place at a heating and ventilation company that was one of Target's suppliers.
The plug-in architecture is a security nightmare, and a source of numerous breaches through which buggy or malicious code was able to reach into users' computers and compromise them.
The way it works is a company detects a breach through the ServiceNow security tool.
Then Sarpedon seized the battlement in his strong hands, and tugged at it till it an gave way together, and a breach was made through which many might pass.
They've issued a breach notice, which is their right, and so obviously they're going through the process with Israel, and it's an employment matter between Rugby Australia, New South Wales Rugby and Israel Folau himself.
An engine failure aboard Southwest 1380 on April 17 resulted in a breach of a passenger's window, through which a passenger was sucked part way out of the plane.
Ms. Hartman shows the Doctor the source of the ghost energy, an invisible breach in the universe through which a mysterious spherical object has arrived.
In all cases there appeared to be a breach in the articular surface through which cytoplasm was apparently moving.
