A tamper-indicating article for attachment to a surface of a substrate comprises (a) a retroreflective sheet and (b) an adhesive layer, wherein the retroreflective sheet comprises a reflective layer, a non-silicone-based release layer adjacent to the reflective layer, and a layer of lenses overlying said release layer and positioned in optical connection with said reflective layer so as to produce retroreflection. The article exhibits an interlayer cohesive failure at the release layer of the retroreflective sheet when an attempt is made to remove the article from the substrate surface. IMAGE
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