The phrase "a policy under which" is correct and usable in written English.
You can use it to describe the conditions or framework of a specific policy.
Example: "The organization implemented a policy under which all employees must complete annual training sessions."
Alternatives: "a policy that allows" or "a policy governing".
He was instrumental in the repeal of "Don't Ask, Don't Tell"—a policy under which gay and lesbian service members were forced to conceal their sexuality or risk expulsion from the military and was a leading supporter of the Patient Protection and Affordable Care Act (2010), which reformed health care.
Theresa May is being urged to consider a policy under which housing rents would be linked to local wage levels.
The campaign also led to the adoption of a policy under which guano can be harvested only every five to seven years.
In June 2003, America's then treasury secretary, John Snow, publicly encouraged China to loosen a policy under which its currency was pegged at 8.28 to the dollar.
Nursing homes object to a policy under which penalties are automatically imposed if, in two consecutive visits, inspectors find deficiencies that cause harm or immediate jeopardy to patients.
Plans to phase out a policy under which people who immigrated to the U.S. illegally as children could work legally and avoid deportation.
Boards of directors should adopt a resignation policy under which a director who does not receive a majority vote in an uncontested election should tender his or her resignation for consideration by the board of directors.
Gov. David A. Paterson proposed on Friday that the State University of New York and the City University of New York be allowed to set their own tuition rates, a plan that would end a longstanding policy under which tuition increases are determined by the State Legislature.
But in women over 40, the rate is less than one in 10 live births – a dip that experts blame on a government policy, under which women lose their right to subsidised fertility treatment if their annual household income rises above 7.3m yen.
One is a life policy, under which the policyholder will pay a premium each month, and on his or her death a predetermined sum is paid to the beneficiaries.
It wants mandatory production controls combined with a "parity" policy under which the government guarantees farmers a profit by establishing minimum prices based on annual average production costs.
