The scientists are taking elaborate precautions to avoid contaminating the site.
From the guardian.co.uk
We sincerely apologize for contaminating the coastal waterways of Massachusetts.
From the businessweek.com
It stayed in soil and got into plants, contaminating milk and meat for decades.
From the courier-journal.com
They also use a dry mop system to avoid contaminating water and reduce water use.
From the ocregister.com
It also has problems with enzyme residue contaminating and degrading the product.
From the sciencedaily.com
The mine abounds in highly contaminating waste, such as smelting dregs and ash.
From the sciencedaily.com
The only conclusion possible is that the assays were detecting contaminating DNA.
From the scienceblogs.com
He also infected a German interrogator with malaria by contaminating his insulin.
From the en.wikipedia.org
We are depleting aquifers, contaminating our rivers, and heating up the planet.
From the guardian.co.uk
More examples
Pollute: make impure; "The industrial wastes polluted the lake"
Make radioactive by adding radioactive material; "Don't drink the water--it's contaminated"
(contaminated) corrupted by contact or association; "contaminated evidence"
(contaminated) rendered unwholesome by contaminants and pollution; "had to boil the contaminated water"; "polluted lakes and streams"
(contaminating) corrupting: that infects or taints
(contamination) the act of contaminating or polluting; including (either intentionally or accidentally) unwanted substances or factors
Contamination is the presence of a minor and unwanted constituent (contaminant) in material, physical body, natural environment, at a workplace, etc.
(Contamination (album)) Contamination is a 1996 album by Belgian electro-industrial act Suicide Commando.
(Contamination (Private Practice)) "Contamination is the eleventh episode from the second season of Grey's Anatomy spin-off show, Private Practice. The episode aired on January 8, 2009 in the United States on ABC.