Which of the following substances should interpreters refrain from using before or during their duties?

Interpreters should refrain from using mind-altering substances before or during their duties due to the critical nature of their work, which requires full cognitive clarity and precision. The role of an interpreter involves conveying messages accurately and effectively, often in high-stakes environments where miscommunication can lead to significant misunderstandings or consequences. Mind-altering substances can impair judgment, affect concentration, and alter perception, compromising the interpreter's ability to perform their duties to the best of their ability.

While caffeinated beverages, nutritional supplements, and herbal teas can have varying effects on energy levels or health, they do not inherently interfere with cognitive functions to the same extent that mind-altering substances do. Thus, avoiding mind-altering substances is critical to maintaining professionalism and ensuring that interpreters can fulfill their responsibilities without any negative impact on their performance.