---
title: "Detecting Risky Behavior Related to Alcohol and Drug Use within Adolescents' Private — Plhák 2026"
description: "Most automated detection of substance use relies on medical records or public platforms like X and Reddit. 64 references."
authors: ["Jaromír Plhák", "Michaela Lebedíková", "Ondrej Sotolar", "David Smahel"]
year: 2026
venue: "Proceedings of the Fifteenth Language Resources and Evaluation Conference"
source: "https://aclanthology.org/2026.lrec-1.201/"
doi: "10.63317/2rjd9g5nbkxv"
licence: "CC BY-NC 4.0 (ELRA, LREC proceedings)"
licence_url: "https://creativecommons.org/licenses/by-nc/4.0/"
summary_licence: "Elamur Cosmic License"
canonical: "https://research.elamur.ai/free/en/papers/plhak-2026-detecting-risky-behavior-related-alcohol/"
---
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# Detecting Risky Behavior Related to Alcohol and Drug Use within Adolescents' Private Messenger Conversations

**Authors:** Jaromír Plhák, Michaela Lebedíková, Ondrej Sotolar and David Smahel · **Year:** 2026 · **Venue:** Proceedings of the Fifteenth Language Resources and Evaluation Conference · **Licence:** [CC BY-NC 4.0 (ELRA, LREC proceedings)](https://creativecommons.org/licenses/by-nc/4.0/)

**Links:** [Publisher's page](https://aclanthology.org/2026.lrec-1.201/) · [PDF](https://aclanthology.org/2026.lrec-1.201.pdf) · [DOI 10.63317/2rjd9g5nbkxv](https://doi.org/10.63317/2rjd9g5nbkxv) · [OpenAlex](https://openalex.org/W7160084548)

**Citations:** 0 citations (OpenAlex, 2026-10-14)

## Summary
Most automated detection of substance use relies on medical records or public platforms like X and Reddit. These sources miss how teenagers talk in private. This paper addresses detecting alcohol and drug talk in adolescents' private chats, mostly written in Czech. Twenty-two teenagers aged 13–17 donated a year of Meta Messenger history. The text was anonymized and split into conversations wherever there was a 60-minute pause. Two trained annotators then labelled part of it using a manual refined to capture youth slang, and a social scientist resolved uncertain cases to form a gold standard. Positive cases turned out to be extremely rare. The authors fine-tuned BERT-based classifiers, tested text-preprocessing variants and compared the results with open-source generative LLMs prompted with Czech-specific examples. The best BERT-based model reached an F1 of 0.817. Generative LLMs performed comparably and can be adapted to other languages, including English. An error analysis identified slang and lookalike words as the main pitfalls. The study shows that this social-science task is feasible in a low-resource language and could support parental mediation and parental control tools.

## Key points
- **Corpus scale:** The corpus has 1,260,492 utterances in 2,807 chat files (90,422 conversations) from 2,165 authors, covering September 2014 to December 2020.
- **Annotation:** Annotators labelled 35,000 conversations containing 272,465 utterances. Only 2,301 utterances (0.845%) were tagged positive by at least one annotator. Inter-annotator agreement was Cohen's κ = 0.609.
- **Preprocessing:** Combining capitalization handling with removal of redundant tags gave the best result in these experiments (F1 ≈ 0.818). Removing emoji or stop words lowered performance.
- **BERT vs. LLMs:** Open-source generative LLMs matched the BERT-based models. Their prompts needed explicit guidance on Czech slang and cultural differences; for example, "420" has no marijuana connotation in Czech.
- **Typical errors:**
  - Both model types missed slang terms such as "skéro" and "zkuřka".
  - LLMs produced false positives on similar-looking words, such as "nadrzenej" (horny), "cigos" (a slur) and "mariin" (a form of the name Marie).
  - LLMs also flagged nicknames that merely mention beer.

*Our summary of the paper, in our own words — not its text. The work belongs to its authors; read it at the links above.*

Fields: [Linguistics & languages](https://md.research.elamur.ai/free/en/shelves/linguistics/)

## Cite

Cite as: Jaromír Plhák, Michaela Lebedíková, Ondrej Sotolar and David Smahel. 2026. Detecting Risky Behavior Related to Alcohol and Drug Use within Adolescents' Private Messenger Conversations. Proceedings of the Fifteenth Language Resources and Evaluation Conference.

The paper itself, not this page. BibTeX from the library's record of the work.

```bibtex
@inproceedings{plhak2026detecting,
  title = {{Detecting Risky Behavior Related to Alcohol and Drug Use within Adolescents' Private Messenger Conversations}},
  author = {Jaromír Plhák, Michaela Lebedíková, Ondrej Sotolar and David Smahel},
  booktitle = {Proceedings of the Fifteenth Language Resources and Evaluation Conference},
  year = {2026},
  doi = {10.63317/2rjd9g5nbkxv},
  url = {https://doi.org/10.63317/2rjd9g5nbkxv}
}
```

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