Kennedy MC, Dong H, Tobias S, Buxton J, Lysyshyn M, Tupper K, Ti L Fentanyl concentration in drug checking samples and risk of overdose death in Vancouver, Canada Am J Prev Med PubMed

Bhuiyan I, Tobias S, Ti L Responding to changes in the unregulated drug supply: the need for a dynamic approach to drug checking technologies Am J Drug Alcohol Abuse PubMed

Ti L, Grant CJ, Tobias S, Hore DK, Laing R, Marshall BDL Development of a neural network model to predict the presence of fentanyl in community drug samples PLoS One PubMed

Crepeault H, Socías ME, Tobias S, Lysyshyn M, Custance A, Shapiro A, Ti L Examining fentanyl and its analogues in the unregulated drug supply of British Columbia, Canada using drug checking technologies Drug Alcohol Rev PubMed

Tobias S, Grant CJ, Laing R, Lysyshyn M, Buxton JA, Tupper KW, Wood E, Ti L What impact did the COVID-19 pandemic have on the variability of fentanyl concentrations in the Vancouver, Canada illicit drug supply? An interrupted time-series analysis BMJ Public Health Link

Beaulac M, Richardson L, Tobias S, Lysyshyn M, Grant C, Ti L Changes in the unregulated opioid drug supply during income assistance payment weeks in Vancouver, Canada: an exploratory analysis Int J Drug Policy PubMed

Tobias S, Lysyshyn M, Buxton J, Tupper KW, Ti L Tobias et al. respond to "Novel surveillance of the unregulated drug supply" Am J Epidemiol PubMed

Tobias S, Grant C, Laing R, Arredondo J, Lysyshyn M, Buxton J, Tupper K, Wood E, Ti L Time-series analysis of fentanyl concentration in the unregulated opioid drug supply in a Canadian setting Am J Epidemiol PubMed

Laing MK, Ti L, Marmel A, Tobias S, Shapiro AM, Laing R, Lysyshyn M, Socías ME An outbreak of novel psychoactive substance benzodiazepines in the unregulated drug supply: preliminary results from a community drug checking program using point-of-care and confirmatory methods Int J Drug Policy PubMed

Beaulieu T, Wood E, Tobias S, Lysyshyn M, Patel P, Matthews J, Ti L Is expected substance type associated with timing of drug checking service utilization?: a cross-sectional study Harm Reduct J PubMed