Final answer:
It is not acceptable to keep the combs locked in a drawer or in a purse, as they should be readily accessible at all times, especially in safety-conscious environments like laboratories.
Step-by-step explanation:
When the question states that all staff are required to ensure that their combs are always on their person, this typically means that the combs should be readily accessible at all times. Therefore, it would not be acceptable to keep them locked in a drawer or in a purse, as they would not be immediately accessible. This level of access is especially important in environments such as laboratories, where personal items like combs could be potential contaminants or safety hazards if not properly managed. Reflecting on the guidelines for a laboratory setting, such as ensuring that long hair is pulled back and that lab benches are cleared, indicates that personal items must be managed in a way that maintains a safe and sterile environment.