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All answers having "Drugs" as clue:

4 Character Answers:

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HASH

MEDS



5 Character Answers:

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SULFA



6 Character Answers:

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HATTER

OPIUMS



7 Character Answers:

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OPIATES

SEDATES



9 Character Answers:

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NARCOTICS



10 Character Answers:

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CONTRABAND



11 Character Answers:

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ANTIBIOTICS



12 Character Answers:

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BARBITURATES