Ketamine-related totals rose.
The annual search-match index increased from 100 in 2022 to 224.0 in 2025. This reflects more matching documents in the archived searches.
MKULTRA / judgment research
Drug trends,
through judicial records.
MKULTRA organizes public court documents for research. This view presents historical patterns in substance-related document searches, using broad annual aggregates.
Aggregate resultsSubstance categories and time periods, with the measurement scope kept visible.
Selected observations
Different substances.
Different trajectories.
Each series uses its own 2022 keyword-search total as a baseline of 100. The index compares change over time within one series.
Cannabis-related totals also increased.
The index reached 142.6 in 2025 against the same substance’s 2022 baseline.
Methamphetamine returned near baseline.
Totals were higher in 2023 and 2024, then ended 2025 close to the 2022 level.
Heroin declined from the 2024 level.
The 2025 index was below 2024 and remained above the 2022 baseline.
Explore the historical view
Annual keyword-search indices.
Select a substance to inspect its four-year trajectory. Values are derived from the archived research totals.
Ketamine
Ketamine: 2022 = 100.0; 2025 = 224.0.
The scale is an index, not a percentage. Each substance has a separate baseline, so these bars do not compare absolute volumes across substances.
Interactive controls are unavailable. The default historical view remains visible.
Source and scope
Source: archived Judicial Yuan criminal-document keyword-search totals, collected in June 2026. Twelve monthly totals are combined for each complete year from 2022 to 2025, then normalized to the keyword’s 2022 annual total.
These are document-search matches. They are not counts of people, unique criminal events, convictions or drug use. One document can match several terms, and related proceedings can produce multiple documents. The series also follows document dates rather than the date of a drug-related event.
This historical view supports description of the retained searches. It does not establish population prevalence, market share or the cause of a change.
Research questions
The next layers of context.
Time trends need further interpretation. These topics remain research questions rather than quantified findings in this public view.
- Emerging substances and changes in recorded terminology
- Multiple-substance mentions within a document
- Changes in reported forms and carriers
- Differences between event dates and document dates
This page publishes national annual indices only. It contains no names, case references, court-level breakdowns, raw text or links to individual decisions.
Project history
How the research method developed.
The decisions behind collection, field definitions, comparison and review.
