"under this practice" is a perfectly valid and usable phrase in written English.
You can use it to refer to an action that is taking place or is about to take place in relation to a certain practice or procedure. For example: "Under this practice, employees must submit their timesheets by the end of the week."
Thousands died over the centuries under this practice, until it was banned by the Stalinist dictator Enver Hoxha.
Under this practice, known as pretesting, drug screenings are performed before a competition or a scheduled test to determine whether illicit substances can be detected.
Under this practice, young offenders serve their time in juvenile facilities until they are 18 or 21, but have an additional sentence in adult prison hanging over them if officials think they still pose a danger.
Under this practice, which goes back to the days of radio, agencies put together a lineup of their own clients — a group that may include writers, directors and stars — in an effort to get a studio to say yes to a given project.
Under this practice, companies whose local currency debts fall due to inflation can run the gain straight through their income statement.
Under this practice, companies whose local currency debts fall merely because of inflation can run the gain straight through their income statement.
Cavour had done much the same thing as Italy's first prime minister, but under Depretis this practice became the established technique of Italian parliamentarism.
This could be argued as under-hospitalization and this practice cannot be generalizable to healthcare settings lacking dedicated dengue care units that can closely monitor the cases.
Under the coalition, this practice has stopped.
Under private equity, this practice flourished.
He roundly criticises this practice under Thatcher and Blair, but acknowledges that it was inconceivable under prime ministers of whom in general he disapproves, namely Heath and Major.
