A reliability study of a marijuana retail surveillance tool found high inter-rater agreement and documented that most Seattle retailers complied with age verification but engaged in various promotional marketing practices.
Read this if you are interested in how legal marijuana retailers market their products and comply with regulations.
Only 1 of 25 retailers displayed health warnings; 96% had interior advertisements
What the researchers found
Researchers field-tested a standardized surveillance tool at 25 randomly selected recreational marijuana retailers in Seattle to assess marketing practices and regulatory compliance. The tool examined three domains: neighborhood context, compliance and security, and marketing.
Most retailers were located near restaurants (92%), grocery stores (68%), and liquor stores (52%). Two were within two blocks of schools and four near parks. Almost all (92%) had exterior age signage and verified age upon entry.
Marketing practices were common: 96% had interior advertisements, most frequently for edibles. Price promotions were found in 68% of retailers, typically as loyalty programs or daily deals. Only one retailer displayed potential health warnings, while three posted health claims. Some retailers sold branded apparel, which is prohibited.
The tool showed high inter-rater reliability (Kappas 0.73-1.00), validating it for standardized surveillance of the emerging legal marijuana retail environment.
Why it matters
As recreational marijuana legalization expands, monitoring the retail environment is essential for understanding how marketing and store placement might influence use patterns. This tool provides a standardized way to track compliance with regulations and identify potential public health concerns, much as alcohol and tobacco retail environments are monitored.
The numbers in context
25 retailers assessed. 92% near restaurants, 68% near grocery stores, 52% near liquor stores, 44% near bars. 2 within two blocks of schools. 92% had exterior age signage. 92% verified age. 96% had interior ads (76 total, average 3 per store). 68% had price promotions. Only 1 displayed health warnings. Inter-rater reliability: Kappa 0.73-1.00.
How the study worked
Two trained observers independently assessed 25 randomly selected Seattle recreational marijuana retailers (20 recreational-only, 5 recreational/medical) using a standardized surveillance tool. The tool evaluated contextual features, compliance measures, and marketing practices. Inter-rater reliability was calculated using Cohen's Kappa.
What this study cannot tell us
Only 25 retailers in a single city were assessed, limiting generalizability. Seattle was an early adopter of recreational marijuana and may not represent other markets. The tool captures observable features but cannot assess digital marketing, social media promotion, or customer-level outcomes. A single snapshot does not capture changes over time.
How to read the evidence
This is a small observational reliability study of a surveillance tool, providing preliminary data on marijuana retail practices in one city.
When this study was published
Published in 2018 with 2017 data from Seattle. The legal marijuana retail landscape has expanded significantly since.
The bigger picture
Lessons from alcohol and tobacco retail research show that marketing environment, pricing strategies, and store density affect consumption patterns. Establishing surveillance infrastructure for marijuana retail early in the legalization process allows regulators to track trends and identify problems before they become entrenched.
Questions still open
- Does proximity of marijuana retailers to schools or parks affect youth use rates? How do marketing practices in marijuana retail compare to those in the alcohol and tobacco industries? Should health warning requirements be standardized across legal marijuana markets?
Common questions
Are marijuana stores following the rules?
Are marijuana stores near schools?
Read the original research
Point-of-sale marketing and context of marijuana retailers: Assessing reliability and generalizability of the marijuana retail surveillance tool.
Preventive medicine reports, 11, 37-41
Citation
Berg, Carla J; Henriksen, Lisa; Cavazos-Rehg, Patricia; Schauer, Gillian L; Freisthler, Bridget. (2018). Point-of-sale marketing and context of marijuana retailers: Assessing reliability and generalizability of the marijuana retail surveillance tool.. Preventive medicine reports, 11, 37-41. https://doi.org/10.1016/j.pmedr.2018.05.010