Drugs, toxins, and trace evidence Across 4. separates the components of a mixture 6. used to specifically identify one substance 10. substances that relieve pain 17. confirms the presence of a questioned substance 21. a drug that is legal but is used in an illegal or inappropriate manner 22. combined effect of substances exceeds sum of individual effect 23. descriptive analysis Down 1. naturally occurring substances that can change normal thought processes, perceptions and moods 2. physical evidence found in small amounts at the scene - items too small to make a physical match, yet large enough to be analyzed 3. analysis using numbers such as measurements 5. do not involve a change in the identity of the substance, such as density and boiling point 7. a substance that can cause injury or health problems from contact through contact, ingestion, or absorption 8. act on the central nervous system to make the user feel better and increase his/her energy alertness while suppressing appetite and fatigue 9. characterizes the tendency of a substance to transform into another substance 11. toxicity effects occur almost immediately 12. exposure over a long period of time 13. combined effect decreases individual effects 14. stabilizes or prevents the precipitation of damaging compounds 15. a natural or synthetic substance designed to affect the subject psychologically or physiologically 16. the amount of a substance that will kill a person 18. the study of radiation and it’s interaction with matter 19. chemical reaction occurs causing a color change 20. a drug that is against the law to have, use, or distribute