chemical testing

The intensive search involved geophysicists, ground-penetrating radar, laser imaging, chemical testing of soil, and cadaver dogs.

The practice of tissue chemical testing is a valuable tool for assessing plant nutritional status during the growing season.

“My chemical testing of the towel played no direct role in implicating Mr. Birch and Mr. Henning or anyone else as suspects in this crime. Further, my scientific testimony at their trial included exculpatory evidence, such as a negative finding of blood on their clothing that served to exonerate them.”

The FBI also did chemical testing.

It’s undetectable without chemical testing.