The series hazard modeling reveals a similar story: For overall eco-terrorist attacks, after the ADA of 1988 enactment, there was an increase in hazard of new attacks, while a reduction in attacks resulted after the enactment of the AETA of 2006 and the USA PATRIOT Act of 2001. [...] Additionally, the enactment of the Anti-tree Spiking Act of 1996 increased hazard of attacks by radical environmental groups while the AETA of 2006 reduced the hazard of another event. [...] To respond to the threats, the U. S. has already passed several bills to prevent terrorist ac- tions, including the Anti-Terrorism and Biological Weapons Acts of 1989, the Anti-Terrorism and Effective Death Penalty Act of 1996, and the USA PATRIOT Act of 2001 to name just a few. [...] As such, below we devote special attention to them and hope the in-depth analysis can provide further understanding of the nature of the phenomenon, and on the potential preventative practices and legal reactions to the issues they raise. [...] The incidents included in the EID are “illegal activity in the United States from 1970 through 2007 that was principally motivated to protest the destruction or deg- radation of the environment, the mistreatment of animals, or both” (2).