Passage Summary: P thinks the new rules are a waste of time because they wouldn't have fixed the last big problem. Q thinks they are valuable because they'll prevent other accidents and save money.

Conclusion: P: The new safety regulations are useless. Q: The new safety regulations are useful.

Reasoning: P argues the regulations are useless because they wouldn't have stopped a specific past fire. Q argues they are useful because they will prevent some future accidents and save the laboratory money.

Analysis: The disagreement centers on the utility of the new regulations. P uses a very narrow standard for 'usefulness'—whether the rules address the specific cause of a past disaster—while Q uses a broader economic and preventative standard. To find the point at issue, apply the 'Agree/Disagree Test': P would agree that the regulations are useless, while Q would explicitly disagree. Look for an answer choice that addresses whether the regulations serve a beneficial purpose.