You will ask how?
Pepper Spray is often used by Law Enforcement agencies in Western countries. Although non-lethal, the pepper spray is an effective way to contain petty wrongdoers and law breakers. Only exceptions are the hardened criminals who show the audacity and boldness to tolerate the pepper sprays (and taser guns).
Going by the sheer number of MPs who needed to be hospitalised after the pepper spray in the Parliament (by an MP opposing the creation of Telangana); one can easily assume that our MPs are not that hardened as we believe them to be.
PS: Pepper Spray is also used by Women for self defence. All a woman has to do is keep the bottle of Pepper Spray in their hand bag; and if she is attacked, point the spray on the attackers eyes and spray.