The phrase "a policy which has" is correct and usable in written English.
It can be used when referring to a specific policy that possesses certain characteristics or features.
Example: "The organization implemented a policy which has proven effective in reducing waste and promoting sustainability."
Alternatives: "a policy that possesses" or "a policy characterized by".
"It is a policy which has significant financial implications.
Lord Curzon's policy, a policy which has caused deep and continuous ill-feeling since its introduction, is definitely reversed.
This would be entirely the wrong thing to do and a policy which has not been put to the country".
In 2012, it drafted a policy, which has since been made law, to protect pedestrians and cyclists.
This is a policy which has nothing to do with economics and everything to do with politics".
Tuition fees, a policy which has worked, was never discussed properly, so the result was no collective ownership.
It was a policy which had only minimum success, but it was widely misunderstood and widely condemned.
Foley says the Aboriginal Tent Embassy ended the era of assimilation, a policy which had been maintained by both Australia's major political parties since federation.
With 97% of those who try making it safely to Christmas Island, and 90% of their refugee claims accepted, the sea passage still looks like a risk worth taking.Mr Abbott has said that by adopting "a foreign policy which has a Jakarta rather than a Geneva focus" he can persuade Indonesia to take back boats that are turned around by the Australian navy.
The relegated status of the Nigerian Railways is a classic illustration of a transportation policy which has sidelined an important and cheap means of transport to foster the growth of privately owned long haulage transport services.
What is not a good thing is an immigration policy which has neither the consent of voters nor any ability to influence the numbers – that's what destroys communities".
