21.   As spring thaws the frozen fields, they are expected to yield evidence of atrocities.

22.   Armstrong has never failed a drug test and the investigation so far has yielded no evidence of improper drug use.

23.   But the investigations failed to yield enough evidence for prosecutors to file charges, he said.

24.   Presiding judge Ermin Briessmann said the three-month trial yielded no evidence that Djajic fired shots in the massacre.

25.   So far none has yielded clear evidence of such work.

26.   So far, none has yielded clear evidence of such work, he said.

27.   Tests of the clothing she wore into the hospital over the weekend also failed to yield evidence of contamination, they said.