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Euphoria (BAC = 0.03 to 0.12%).
- Subject may experience an overall improvement in mood and possible euphoria.
- They may become more self-confident or daring; they may become more friendly or talkative, and/or social.
- Their attention span shortens. They may look flushed.
- Their judgment is not as good — they may express the first thought that comes to mind, rather than an appropriate comment for the given situation. --See: in vino veritas
- They have trouble with fine movements, such as writing or signing their name.
Lethargy (BAC = 0.09 to 0.25%)
- Subject may become sleepy.
- They have trouble understanding or remembering things, even recent events. They do not react to situations as quickly.
- Their body movements are uncoordinated; they begin to lose their balance easily, stumbling; walking is not stable.
- Their vision becomes blurry. They may have trouble sensing things (hearing, tasting, feeling, etc.).
Confusion (BAC = 0.18 to 0.30%)
- Profound confusion — uncertain where they are or what they are doing. --Dizziness and staggering occur.
- Heightened emotional state — aggressive, withdrawn, or overly affectionate. Vision, speech, and awareness are impaired.
- Poor coordination and pain response. Nausea and vomiting sometimes occurs.
Stupor (BAC = 0.25 to 0.40%)
- Movement severely impaired; lapses in and out of consciousness.
- Subjects can slip into a coma; will become completely unaware of surroundings, time passage, and actions.
- Risk of death is very high due to alcohol poisoning and/or pulmonary aspiration of vomit while unconscious.
- Loss of bodily functions can begin, including bladder control, breathing, heart rate.
Coma (BAC = 0.35 to 0.50%)
- Unconsciousness sets in.
- Reflexes are depressed (i.e., pupils do not respond appropriately to changes in light).
- Breathing is slower and more shallow. Heart rate drops. Death usually occurs at levels in this range.
Death (BAC more than 0.50%)
- Can cause central nervous system to fail, resulting in death.
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