The phrase "a policy whose" is correct and usable in written English.
It can be used when referring to a specific policy and indicating possession or a characteristic related to that policy.
Example: "We need to implement a policy whose effectiveness can be measured over time."
Alternatives: "a policy that has" or "a policy with".
A policy whose explicit aim is to make women slower.
A policy whose declared principles include a huge stress on stopping genocide can have perverse effects; it can actually make genocide more likely.
After Lenin recovered from his initial disbelief in this "betrayal" of the International, he proclaimed a policy whose audacity stunned his own Bolshevik comrades.
"But at the same time, we cannot simply send men in Iraq, in my opinion, to support a policy whose purpose we don't see.
Democratic politicians are spending their time protesting against Wal-Mart, a giant retailer that bans unions, and calling for higher minimum wages, a policy whose economic effects are debatable and which would have little impact on most Americans.
The primary justification for his own willingness to consider capping mortgage deductions is to replace lost revenue from his proposed 20 percent across-the-board federal tax cut, a policy whose prime beneficiary would be upper-income households.
Turkey's stature in the Middle East has soared in recent years as it became a vocal defender of Palestinian rights and an outspoken critic of Israel and pursued a foreign policy whose intent was to become a decisive power in regional affairs.
It's a negotiating policy whose name – the so-called Comprehensive Land Claims – is intended to make your eyes glaze over.
Under the G.O.P. plan, every Medicare enrollee would be offered a drug policy whose premiums and other costs would be heavily subsidized or eliminated for low-income families.
But, in a humiliating defeat for the Liberal Democratic leader, Nick Clegg, voters rejected his proposal to reform the electoral system — a flagship policy whose support among Britons had become interwoven with his own.
But they are not, because this government and the last Labour administration have continued with a drugs policy whose primary measure of outcome is the number of users, rather than the harms of drug or alcohol use.
