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Boland, Philip, Sturm, Tristan, Shorter, Gillian W ORCID: https://orcid.org/0000-0001-5752-2297 and McKay, Stephen (2026) Are drugs bad for business (improvement districts)? Policy mobility, security planning, and frontier politics. Urban Geography, Early online, https://doi.org/10.1080/02723638.2026.2615966.