Needle-Exchange Programs: Organized services for exchange of sterile needles and syringes used for injections as a potential means of reducing the transmission of infectious diseases.Syringes: Instruments used for injecting or withdrawing fluids. (Stedman, 25th ed)Substance Abuse, Intravenous: Abuse, overuse, or misuse of a substance by its injection into a vein.BaltimoreHarm Reduction: The application of methods designed to reduce the risk of harm associated with certain behaviors without reduction in frequency of those behaviors. The risk-associated behaviors include ongoing and active addictive behaviors.Needles: Sharp instruments used for puncturing or suturing.International Educational Exchange: The exchange of students or professional personnel between countries done under the auspices of an organization for the purpose of further education.Needle Sharing: Usage of a single needle among two or more people for injecting drugs. Needle sharing is a high-risk behavior for contracting infectious disease.HIV Infections: Includes the spectrum of human immunodeficiency virus infections that range from asymptomatic seropositivity, thru AIDS-related complex (ARC), to acquired immunodeficiency syndrome (AIDS).ConnecticutDrug Users: People who take drugs for a non-therapeutic or non-medical effect. The drugs may be legal or illegal, but their use often results in adverse medical, legal, or social consequences for the users.Directed Tissue Donation: Tissue, organ, or gamete donation intended for a designated recipient.Program Evaluation: Studies designed to assess the efficacy of programs. They may include the evaluation of cost-effectiveness, the extent to which objectives are met, or impact.Law Enforcement: Organized efforts to insure obedience to the laws of a community.Drug and Narcotic Control: Control of drug and narcotic use by international agreement, or by institutional systems for handling prescribed drugs. This includes regulations concerned with the manufacturing, dispensing, approval (DRUG APPROVAL), and marketing of drugs.Risk-Taking: Undertaking a task involving a challenge for achievement or a desirable goal in which there is a lack of certainty or a fear of failure. It may also include the exhibiting of certain behaviors whose outcomes may present a risk to the individual or to those associated with him or her.Biopsy, Needle: Removal and examination of tissue obtained through a transdermal needle inserted into the specific region, organ, or tissue being analyzed.Police: Agents of the law charged with the responsibility of maintaining and enforcing law and order among the citizenry.Substance-Related Disorders: Disorders related to substance abuse.United StatesPharmacies: Facilities for the preparation and dispensing of drugs.Education, Medical: Use for general articles concerning medical education.