The Oral Fluid Drug Test Cassette ecosystem comprises a tightly linked set of upstream, midstream, and downstream actors that collectively enable the design, production, distribution, and application of point‑of‑care drug screening solutions. Upstream, raw material and component suppliers provide immunoassay reagents, membranes, and plastics that meet pharmaceutical‑grade specifications. Midstream participants include original equipment manufacturers (OEMs) that assemble cassettes, technology providers that supply lateral flow platforms, and system integrators that embed electronic readers. Downstream, distributors and channel partners move finished kits to clinical laboratories, occupational health programs, correctional facilities, and law‑enforcement agencies, which constitute the primary end users. Value is captured through component margins, assembly contracts, and service agreements, while regulatory compliance underpins market access.