Edited sentence: 39/07/C, which governs stab resistant body armor performance in the UK.Armor certified against only spikes or only edged blades does not necessarily provide protection against the other.For stab resistant armor to carry a spike resistance (SP) rating in the UK, it must first pass minimum knife resistance (KR) performance tests.HOSDB Body Armour Standards for UK Police (2007)Part 3: Knife and Spike Resistance.In the US armor can be certified to protect again spikes, edged blades or both.In the US, the National Institute of Justice (NIJ) has established a stab resistant body armor test standard (NIJ STD 0115.00), which defines two threat types: spike and edged blade.Manufacturers of body armor can voluntarily submit armor models for compliance testing through the National Law Enforcement and Corrections Technology Center in Rockville, MD.Modern body armor vests used by military, prison and police officials are tested to various standards, which establish minimum performance ratings against specific threats.National Institute of Justice Standard 0115.00, Stab Resistance of Personal Body Armor.Performance ratings do not extend beyond the specific threats and conditions defined within the parameters of the test standard.Statistically it is impossible to guarantee with 100% confidence that a particular model of armor will defeat all ballistic or hand-wielded threats of any geometry, mass and composition at any velocity.The NIJ standard is based on work conducted by the Police Scientific Development Brach (PSDB) in the United Kingdom.The PSDB standard was replaced in 2007 with the current Home Office Scientific Development Branch (HOSDB) publication No.The PSDB work studied what kind of weapons are commonly used in stabbing attacks and what levels of impact energy fit young men are capable of generating during an attack.The US and UK standards are nearly identical however in the UK there are no standalone ratings for spike resistance.The study resulted in minimum performance ratings for armor used in the UK, as defined under PSDB publication 6/99.Threat levels 1, 2 and 3 are based on impact energies of 24-, 33- and 43-joules respectively.Through the program, manufacturers certify that their armor will defeat the specified threat at one of three threat levels.While frequently used when referring to body armor, the colloquial terms “bullet proof” and “stab proof” are misleading