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Group Design02:01

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The most basic experimental design involves two groups: the experimental group and the control group. The two groups are designed to be the same except for one difference— experimental manipulation. The experimental group gets the experimental manipulation—that is, the treatment or variable being tested—and the control group does not. Since experimental manipulation is the only difference between the experimental and control groups, we can be sure that any differences between the two are due to...
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Toxicity tests in animals are grounded on two main assumptions: first, the effects observed in laboratory animals can be extrapolated to humans, especially when adjusted for body surface area; second, high-dose exposure in animals is essential to identify potential human hazards from lower doses. This is based on the quantal dose-response concept, which faces the challenge of extrapolating results from relatively few test animals to much larger human populations. For example, a 0.01% incidence...
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Urinalysis is a widely used diagnostic test that analyzes urine's physical, chemical, and microscopic characteristics. Healthcare providers use it to detect and monitor various health conditions, including renal disease, urinary tract infections (UTIs), diabetes, and metabolic or systemic disorders.Components of UrinalysisUrinalysis consists of three primary components: physical, chemical, and microscopic examination. Each provides unique insights into the urine sample and, by extension, the...
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Related Experiment Video

Updated: Jul 6, 2026

High-throughput and Comprehensive Drug Surveillance Using Multisegment Injection-Capillary Electrophoresis-Mass Spectrometry
10:17

High-throughput and Comprehensive Drug Surveillance Using Multisegment Injection-Capillary Electrophoresis-Mass Spectrometry

Published on: April 23, 2019

Random drug testing in US public school districts.

Chris Ringwalt1, Amy A Vincus, Susan T Ennett

  • 1Pacific Institute for Research and Evaluation, 1516 E Franklin St, Suite 200, Chapel Hill, NC 27514, USA. ringwalt@pire.org

American Journal of Public Health
|April 3, 2008
PubMed
Summary

In 2005, 14% of US public school districts with high school grades conducted random drug testing. Most tested athletes, while 28% tested all students, potentially exceeding Supreme Court limits.

Related Experiment Videos

Last Updated: Jul 6, 2026

High-throughput and Comprehensive Drug Surveillance Using Multisegment Injection-Capillary Electrophoresis-Mass Spectrometry
10:17

High-throughput and Comprehensive Drug Surveillance Using Multisegment Injection-Capillary Electrophoresis-Mass Spectrometry

Published on: April 23, 2019

Area of Science:

  • Public Health
  • Education Policy
  • Substance Abuse Prevention

Background:

  • Random drug testing in schools is a debated policy for deterring substance use.
  • Previous research has focused on specific populations, like athletes, rather than district-wide implementation.

Purpose of the Study:

  • To estimate the prevalence of random drug testing policies in US public school districts with high school grades.
  • To identify the scope of random drug testing (athletes, extracurricular participants, all students).

Main Methods:

  • A nationally representative sample of 1343 public school districts with high school grades was surveyed in spring 2005.
  • Data were collected from drug prevention coordinators within these districts.

Main Results:

  • 14% of surveyed districts reported conducting random drug testing.
  • Nearly all districts tested athletes; 65% tested students in extracurricular activities.
  • 28% of districts tested all students, a policy potentially exceeding US Supreme Court sanctions.

Conclusions:

  • A notable proportion of US public school districts implemented random drug testing by 2005.
  • Testing policies varied, with some districts exceeding legal boundaries for universal student drug screening.