| 100% | DDT | 3 | It's been banned in the U.S. since 1972 |
| 74% | PCBS | 4 | They've been banned in the U.S. since '79 |
| 72% | LAWNDARTS | 9 | Outdoor game whose sale has been banned in the U.S. since 1988 |
| 65% | DDT | 3 | Insecticide banned in the US since 1972: Abbr. |
| 62% | DDT | 3 | Chemical banned in the U.S. in 1972 |
| 62% | PCB | 3 | Pollutant banned in the U.S. since 1979: Abbr. |
| 62% | LAWNDART | 8 | Backyard projectile banned in the U.S. since 1988 |
| 61% | DHLAWRENCE | 10 | His "Lady Chatterley's Lover" was banned in the U.S. until 1959 |
| 61% | DDT | 3 | Target of a 1972 ban in the U.S. |
| 59% | RUBELLA | 7 | It was eliminated from the U.S. in 2004 |
| 59% | HOFF | 4 | Harry S —, English author whose 1934 debut novel Trina was published in the US as It Happened in PRK |
| 59% | NATO | 4 | The U.S. is in it |
| 58% | LSD | 3 | The U.S. banned it in 1967 |
| 58% | LSD | 3 | The U.S. banned it in 1968 |
| 57% | OAS | 3 | The U.S. and Can. are in it |
| 52% | EMMA | 4 | Girls' name that's been top five in the U.S. every year since 2002 |
| 52% | HIQ | 3 | What is the oldest academic quiz competition in the U.S. (since 1948)? |
| 52% | CASUMARZU | 9 | Sardinian sheep milk cheese that is banned in US as it contains live maggots and can be consumed only while the maggots are still alive: 2 wds. |
| 52% | OPEC | 4 | The U.A.E. is in it |
| 52% | BIBLE | 5 | With 4-Down, much of the Southeast U.S. is in it |
| 51% | ULYSSES | 7 | Novel banned in the U.S. until 1933 |
| 51% | PDT | 3 | S.F. is on it in the summer |
| 51% | OPIUM | 5 | It was finally banned in the USA in the Exclusion Act of 1909 |
| 51% | ULYSSES | 7 | Classic novel banned in the U.S. until 1933 |
| 51% | LSD | 3 | It was dropped in the 60's |
| 51% | ACID | 4 | It was dropped in the 60's |
| 50% | NATO | 4 | The U.K. is in it, but Ire. is not |
| 50% | DDT | 3 | The EPA banned it in 1972 |
| 50% | BANGAGONG | 9 | T. Rex hit that was titled “Get It On” in the U.K. |
| 50% | AZERA | 5 | Korean sedan to be discontinued in the U.S. after 2017 |