What type of technique may be ineffective on a subject under the influence due to lack of pain sensation?

The fluid shockwave striking principle relies on generating a powerful force that can incapacitate a subject by delivering shockwaves through the body. However, when a person is under the influence of certain substances, their pain sensation may be significantly diminished or altered. This means that they might not respond to the impact of a shockwave in the same way a sober individual would. Instead of being incapacitated or deterred by the force, the subject may experience little to no reaction, rendering the technique ineffective.

In contrast, methods like mechanical control and stunning techniques often involve direct physical restraint or temporary incapacitation that might still be successful, even in those who may not feel pain as acutely. Motor dysfunction relates to the impairment of movement, which can also occur regardless of pain perception. Thus, fluid shockwave striking principle is clearly less effective in this scenario due to the altered responses in individuals affected by substances.