The phrase "a practice that could" is correct and usable in written English.
It can be used when discussing a potential or hypothetical practice that may have certain effects or outcomes.
Example: "Implementing a practice that could enhance employee productivity is essential for our company's growth."
Alternatives: "a method that might" or "an approach that has the potential to".
And besides, government policy requires outfitters to spread feed mixture, a practice that could result in jail sentences for baiting in many parts of the United States.
With a new crop of applicants, however, Icann initially accepted proposals for closed or restricted generic domains, a practice that could limit competing views and businesses.
This did not prevent the Manichean elite from enslaving less "enlightened" souls to till their soil and harvest their produce, a practice that could hardly have endeared them to the local peasantry.
Whatever the motives of the oil companies, when such big polluters are willing to put a price on their emissions – a practice that could cost them significantly more to do business – it's a big deal.
Many have condemned solitary confinement as a practice that could amount to torture, including the UN special rapporteur on torture, Juan Méndez, who has called for a global ban in all but exceptional cases.
To keep weight down, engineers for the 640-horsepower SRT Viper made extensive use of carbon-fiber body panels, and Mr. Kliesch called the weight-saving strategy a practice that could translate into fuel economy across the Chrysler line.
Listening to the radio, then, would be a "civic practice" that could create a more democratic society by exposing people to diversity.
If not properly regulated, this is naturally a dangerous practice that could easily threaten a person's well-being.
It is a dangerous practice that could unintentionally silence an officer's sudden call for help.
Physical removal of potentially infective cysts before exposing a new group of cattle to the pen is a management practice that could reduce the potential for cyst transmission.
In fact, in the second quarter filing, JPMorgan continued to use a disclosure practice that could prevent investors from detecting in the future whether the bank was pursuing the sort of derivatives strategy that got it into hot water.
