Key evidence was not properly protected against possible contamination, the committee said.

Food safety of ground meat issues are due to possible bacterial contamination.

In terms of possible contamination, a few slips wouldn't matter - the news, at least so far, was good on that score.

No attempt was made to assess the possible contamination of the product.

Their concerns seem to center around possible contamination of data.

The report did, however, raise concerns about possible contamination from ordnance at the site.

This industry provides jobs for local residents, but has raised concerns over possible contamination of the lake.

And I doubt they'd take them back due to possible contamination- you might want to get even through biological warfare.

Tests will be conducted on Thursday for possible contamination of the school itself in an effort to determine whether it is safe.

And possible contamination of a few samples did not matter where there were so many others, all pointing to the same person.