Verb (used with object) : to contaminate a lake with sewage. ,to contaminate a laboratory.    From Dictionary.com. 

GMOs on the contrary are contaminative, unfriendly to our biodiversity, and pose a threat to the existence of our indigenous seeds, to organic farming systems, and to human and animal health in general.    From Wordnik.com.  [Dear Wellesley College, my alma mater, and Robert Paarlberg, a professor there] Reference

Shaha said GMOs threatened Kenya's environment as it was contaminative and unfriendly to bio diversity posing a threat to the existence of indigenous seeds, organic farming system, human and animal health.    From Wordnik.com.  [Dear Wellesley College, my alma mater, and Robert Paarlberg, a professor there] Reference

But "what's burning is on the surface, part of the contaminative substances has gone into bed deposits which are the last to burn.".    From Wordnik.com.  [The Sydney Morning Herald News Headlines] Reference

Psychological distress, on the other hand, was significantly related to accounts that were low in closure, high in contaminative imagery and high in themes of personal contamination. ".    From Wordnik.com.  [Health News from Medical News Today] Reference