Until this point, the debate over the Senate bill had focussed on the rules for the commissions, or trials.
Experts said that a stricter standard — "with a reasonable degree of medical certainty" — is used in criminal investigations or trials.
Any arrests or trials might have disturbed the fragile peace that York embraced after the killing was over.
But Zardari, who traffics heavily in metaphors of combat, seems to prefer either guile or trials of strength.
An Israeli human rights organization here estimated recently that about 1,000 Palestinians are being held without charges or trials, compared with 36 a year ago.
Dr. Feigal declined to estimate the cost or size of the eventual trial or trials, but similar tests have cost millions of dollars.
Those that have done so possessed the power to threaten the collaborators or murderers with exposure or trials if they did not talk.
He preferred the methods of federal agents, who didn't consider their cases closed until pleas were entered or trials took place, and applied to join the A.T.F.
The detained activists are from 18 countries, including Russia, and a long detention or trials could draw unwelcome international attention to Russia's tough policy against protests.
A second show at Marlborough House included a selection of sketchbooks and a small group of preparatory sketches, or "trials of effects for pictures".
