показавший свою надёжность на практике(Though they have denied any connection between the case and the crackdown on Tajiks in Russia, the authorities appear to be following a tried-and-true script. NYT)
отработанный(Though they have denied any connection between the case and the crackdown on Tajiks in Russia, the authorities appear to be following a tried-and-true script. NYT; напр., о конструкции)