UNIFORM CONTROLLED SUBSTANCES – Amends existing law to revise provisions regarding controlled substances.

H 29 amends Idaho's controlled substances laws to add numerous specific synthetic opioids to Schedule I (the most restrictive category) and creates a broad definition covering future fentanyl-related substances. The bill directly affects law enforcement, healthcare providers, and individuals in Idaho by prohibiting possession of these newly listed compounds, including 90+ specific fentanyl analogs like "ortho-fluorofentanyl" and "methoxyacetyl fentanyl," plus any structurally similar substances. Key mechanisms include updating the Schedule I list with detailed chemical names and establishing a catch-all definition for "fentanyl-related substances" based on structural modifications. This bill becomes effective July 1, 2025, and does not change existing penalties or medical exemptions.