Before that, veteran players were tested only once per year, during pre-season.
Women might be tested only once or twice during their 30s but would get fairly good protection, Ms. Sherris said.
Williams has been tested only once in the last two weeks, in a three-set quarterfinal against Svetlana Kuznetsova.
His loyalty to Preston was tested only once, on the famous occasion when Palermo of Serie A came in for him with an offer of £10,000 for two seasons.
In fairness to Villa, despite Rapid owning possession, Guzan found himself truly tested only once more, that just after the hour when he was at full stretch in pushing wide a Veli Kavlak drive.
"Come on, who's fooling who?" Don Catlin, a former director of the U.C.L.A. Olympic Analytical Laboratory, said: "It doesn't take much for an athlete to figure out that there are ways around being tested only once a year.
Using this parameter ensures constraint 6 is tested only once for each pair of requests.
Thus, information that was tested twice was not remembered better on a later quiz, compared to information that was tested only once.
Half of the words were tested after a short delay (i.e., 1 day, T1) and again after a long delay (i.e., 1 week, T12), whereas the other half were tested only once after the long delay (T2).
Data collected from a second group that were tested only once at 90 days of age, suggested that the observed adverse Tat effects for males and females early in development were maintained with age.
Subjects were tested only once.
