Passage Summary: A legislator wants to ban all cancer-causing food additives, but a commentator says that's overkill because tiny amounts aren't dangerous, so we should just set a 'safe' limit.

Conclusion: The government should establish a safe maximum level for cancer-causing additives rather than banning them entirely.

Reasoning: Modern technology can detect trace amounts of chemicals that are far below the threshold required to actually increase cancer risk in humans.

Analysis: The legislator needs to find a flaw in the commentator's 'safe limit' proposal. To weaken the commentator's stance, the legislator should point out a risk that the commentator ignored. For instance, if these chemicals accumulate in the body over time, even a 'safe' daily level could eventually become dangerous. Alternatively, the legislator could argue that it is scientifically impossible to determine a single safe level for the entire population. Look for an answer that suggests the 'above zero' threshold is still a threat to public health.