The use of Corporal Punishment, CP, in behaviour modification is a complex social science filled with unproven theories and opinions. This broad study encompasses 18,000 enrollments from 13 diverse institutional environments, of which 4,500 minors received CP, and provides actual empirical proof for questions like: (1) How does CP relate to the three group-types of individuals? (2) Is CP effective, and to what degree is it effective? (3) For what offence types is CP more or less effective? (4) Does CP create bullies or does it deter them? (5) How does CP compare to suspensions? (6) How does CP compare to confinements? (7) Does applying CP with greater intensity increase effectiveness? (8) Are repeat offenders punished with greater intensity? (9) Is CP more or less effective for various age groups? (10) Was there sexual discrimination in applying SCP? (11) To what degree is peer pressure a factor at school? (12) Is there seasonality in misbehaviour at school? (13) Are there ways to detect abuse in applying sanctions at school? The findings speak directly to the optimization of CP deployment in the public schools of 19 US States where CP is practiced today. However, they also speak to school environments where CP-alternatives such as suspensions are used. Further, this work does NOT advocate parents to spank. However, the Canadian "spanking defence" laws are also examined against these findings, and suggest these guidelines are the most empirically correct and optimally balanced that exist on the planet today. An unexpected side benefit is that clear answers are provided to various erroneous claims swirling around this issue.