A lockout/tagout program requires specific training for employees performing the procedure, and as part of that training employees need to be certified for performing LOTO.
Once the training deck is presented by a competent person to employees, either in a 1-on-1 training or in a classroom environment, they should go out and perform a lockout/tagout under controlled conditions. If successfully completed, that employee would then be certified as able to perform a lockout/tagout under a Control of Hazardous Energy Program.
It is best recommended to perform the certification on all types of energy in a workplace. Meaning, if the workplace has electrical hazards and pneumatic hazards, that either a piece of equipment with both hazards or 2 seperate pieces of equipment should be used for the certification.
As to who can perform the certification review, it can first be observed by the competent person who taught the class, then once certified, the employee can go and perform the observation for other employees.
The certification should be performed annually, to ensure employees retain the necessary knowledge to perform their job safely.
If an employee violates the Hazardous Energy Control Policy, before they can perform lockout/tagout again they must be recertified.
Retain every certification form for active employees and forms for all terminated employees for 3 years after employment ends. This level of record retention will aid if there is ever an investigation after an injury related to uncontrolled hazardous energy.