Drug abuse is a public health issue, particularly among adolescents and young adults. Therefore, the purpose of our study is to determine the prevalence rate of drugs use and to identify certain factors that can serve as predictors of drug use. A total of 431 students from Mohammed V University in Rabat participated in this descriptive cross-sectional survey. The prevalence of drug use (regular users and experimenters) was 32.9%. Cannabis has a frequency of 13%, whereas other substances and other psychotropics have a prevalence of 3.8%. The most common average age of onset of substance use was 15. Males had the greatest likelihood of becoming drug addicts. We discovered a high consumption of drugs among university students at the end of this work, implying the need to establish a programme to combat drug addiction, the starting point of which will undoubtedly be prevention at the primary and secondary school levels, requiring the participation of all those involved in the field of education.

In forensic toxicology, the preservation of matrices is a crucial stage in the analysis that affects the accuracy and reliability of the findings. To reduce interference and improve the findings’ interpretation, specimens should be maintained in the right environment. For analytical objectives in forensic toxicology, we aim to characterize the modalities of preservation of the distinct matrices for each incriminated toxin. A comprehensive literature search in both English and French languages was conducted using the keywords "forensic samples preservation" to find pertinent papers in the PubMed and ScienceDirect databases. The results were then carefully examined. The preservation method based on the biological matrix and the required harmful substances was the major focus of the investigation. This bibliographic research’s objective is to understand the sample preservation methods used in diverse studies as well as each method’s limitations in light of the biological matrix and xenobiotics being investigated. The mode and duration of conservation depend closely on the matrix and the toxins to be sought. Certain hazardous compounds' chemical stability in biological matrices is influenced by storage conditions compliance. Therefore, it is apparent that forensic scientists would benefit from knowledge of the sampling and storage procedures for substances suspected of posing a threat.                         Peer Review History: Received: 17 December 2022; Revised: 9 February 2023; Accepted: 5 March, Available online: 15 March 2023 Academic Editor: Dr. Marwa A. A. Fayed, University of Sadat City, Egypt, maafayed@gmail.com Received file:                             Reviewer's Comments: Average Peer review marks at initial stage: 6.0/10 Average Peer review marks at publication stage: 7.0/10 Reviewers: Dr. Sally A. El-Zahaby, Pharos University in Alexandria, Egypt, sally.elzahaby@yahoo.com Dr. Nuray Arı, Ankara University, Turkiye, ari@ankara.edu.tr Dr. Bilge Ahsen KARA, Ankara Gazi Mustafa Kemal Hospital, Turkey, ahsndkyc@gmail.com Similar Articles: STORAGE EFFECT ON THE GC-MS PROFILING AND ANTIOXIDANT ACTIVITIES OF ESSENTIAL OILS FROM LEAVES OF ANNONA SQUAMOSA L.