Abstract: A device for deterring theft of an article, including a fragile vial containing a theft deterring substance; a vial carrier structure and a cover structure. The carrier structure includes a weakened region allowing the vial carrier to yield if a force is exerted on the attachment, thereby causing the vial to break due to loads transferred via vial engaging surfaces. The connection between the carrier structure and the cover structure is formed by two or more distinct local connections separated by a central area and located spaced away from the attachment in opposite longitudinal directions of the vial. The proposed device is of a simple cost-effective and light construction while the vial reliably fractures if an unauthorized attempt is made to remove the device.