Final answer:
Counterfeit bills would not have the line embedded within the bill that is called a Security thread. This security thread is a special feature embedded within the banknote to prevent counterfeiting.
Step-by-step explanation:
Counterfeit bills would not have the line imbedded within the bill that is called a Security thread.
This security thread is a special thread or strip embedded within the banknote that contains specific features such as microprinting, color-changing ink, or holographic effects, making it difficult to replicate.
The security thread is an important anti-counterfeiting measure used in currency around the world.
For example, Australian dollar bills are printed on polymer with a diffraction grating security feature, while New Zealand and Taiwan use similar technologies to prevent counterfeiting.
The United States currency includes a thin film interference effect as part of its security features. All these measures, including the security thread, make it easier for people to identify genuine banknotes from counterfeit ones.