Explanation
If an individual is unable to perform any specific task as a result of physical or mental unfitness, then that individual is treated as a disabled individual. Disablement can be temporary or permanent.

The said requirement might affect the enforcement of the law in the following manner:

Firefighters and law enforcement officers need to be active and perform a lot of physical tasks. So, it can be expected that analytical tasks can help the disabled candidates to make a good earning for themselves instead of being discriminated because of their disability.
The firefighters and law enforcement officers might feel comfortable if the testing criteria are set as per their disability. The employer might need to make expenses for the same. The individuals might showcase their true talent irrespective of their disability.
Sample Response
Disabilities Act in Country A enforces the managers to provide employment opportunities to disabled individuals who can perform well.

The said requirement might affect the enforcement of the law in the following manner:

Law enforcement officers and firefighters require a high level of analysis and physical activity. Many of the individuals might not be able to perform well in terms of the physical aspect because of the disability, but they might perform extraordinarily in terms of the analysis aspect.
A human resources manager might need to spend more funds for testing such candidates. Employers need to be careful while considering the functional areas where the disabled individuals will be placed.