Inclusion Criteria:  Male or female Adults age 21-49 Normal weight for body size, based on BMI table General good health, as determined by a verbally provided medical history Normal brief neurological exam Renal and hepatic function within normal ranges Able to provide written informed consent to participate  Exclusion Criteria:  Drug allergies to scopolamine or other belladonna alkaloid Use of medications within 1 week of starting the study Use of an investigational drug within 30 days of starting the study Tobacco smoking within the past year Blood donation or significant blood loss within 30 days of starting the study Significant gastrointestinal disorder (e.g. Crohn's Disease, ulcerative colitis, chronic constipation), asthma, glaucoma, prostate problems, urinary obstruction, or seizure disorders History of alcohol or other drug abuse Pregnancy or suspected pregnancy, or lactation (pregnancy will be confirmed with urine pregnancy testing prior to drug administration) Consumption of grapefruit juice within 7 days of scopolamine (SCOP) administration Nasal, nasal sinus, or nasal mucosa surgery within 90 days prior to study initiation Other significant surgeries within 90 days Significant deviated septum that blocks air flow in one nostril Rhinitis, sinus infection, severe allergies, and other upper respiratory infections within 30 days prior to the study Current use of an intranasal medication Wheezing or other respiratory problem Unable to consent Prisoner