Your tax dollars at work?  Roundup Ready coca plants may have evolved resistance to the U.S. drug interdiction efforts in Columbia.  After several years of spraying Roundup, this variety appears to be resistant to the spray.  We appear now to be helping coca farmers by killing all the weeds for them!

From the standpoint of natural selection theory, there are two possibilities for how this happened.  (1) Natural variation allowed a few plants to be resistant, farmers noticed and distributed cuttings post-haste.  As United States spraying efforts destroyed all the other varieties, after a few years fields were full of Boliviana Negra.  (2) Drug cartels used their considerable financial resources to hire a rogue geneticist to insert the same gene used for the approved and financially successful Roundup Ready soy bean plant.

Either method demonstrates an application of the basic principles of natural selection.