I apologize for the U.S.-centric response. It can be challenging to find specific cases involving false statements and falsified material in relation to marijuana legislation in other countries, as court documents and legal cases may not be as widely accessible or publicized. However, I can provide a general example of a country where false information played a role in shaping marijuana policy.

India: In the 1980s, India was under international pressure to criminalize cannabis, particularly from the United States. During this time, false or exaggerated claims about the dangers of cannabis use were circulated by anti-drug campaigners and the media. These claims included the notion that cannabis use led to severe mental illness, criminal behavior, and was a gateway to harder drugs. While not directly involving the falsification of doctors' signatures or testimonies, these false statements and misconceptions played a role in shaping public opinion and the government's decision to criminalize cannabis in India under the Narcotic Drugs and Psychotropic Substances (NDPS) Act of 1985.

Please note that this example does not involve a specific legal case or the falsification of doctors' signatures and testimonies but demonstrates how false information can influence policy decisions in other countries. If you have a particular country in mind, I can try to find more information related to that country's marijuana policy and related legal cases.
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