18. Which is most important to check when inspecting by touch a possible fraudulent piece of ID thickness stickiness sharp corners chipped edges?

When inspecting a possible fraudulent piece of ID by touch, the most important factor to check is thickness. Authentic IDs typically have a specific thickness that feels consistent and uniform, while counterfeit IDs may be too thin or too thick. Additionally, checking for sharp corners and chipped edges can help identify signs of poor quality or improper production, which are common in fraudulent IDs. Stickiness is less critical but can indicate low-quality materials or printing processes.