This study set out to test the effectiveness of a non captive penetrating bolt gun. The study consisted of two test, the first involving 100 piglets who were less than 72 hours old. After being stunned the pigs were analyzed for breathing, heart beat, leg spasms and other signs to rate effectiveness. 10 pigs were further assessed to investigate the skull fracture and brain hemorrhage. All the pigs were rendered insensible, leg spams lasted for an average of 229 seconds, and time to full cardiac arrest was 444 seconds. Five piglets had to receive a second treatment as they has a sustained heartbeat for over 10 minutes. The second test involved 5 pigs each in four different weight classes. The pigs were put on  a collection of medications to minimize there pain. Only one pig required a second treatment because of rhythmic breathing, all other pigs were absent of breathing immediately. Leg spasms lasted 148 second and full cardiac arrest was reached in 371 seconds. One pig had be euthanized using an alternative method because of a sustained heartbeat. Although brain damage in the anesthetized piglets was less severe than that of the conscious neonates, the Zephyr still effectively induced cardiac arrest in all but one piglet.