In the United States, clenbuterol is legal, so American beef may have clenbuterol. However, according to American law, any beef containing clenbuterol must be clearly marked. That is to say, American beef in Sam may contain clenbuterol if it is labeled with beef or pork containing clenbuterol. And if the beef or pork without clenbuterol is marked, it is definitely not clenbuterol.

Please note that the international restrictions on the use of clenbuterol are not exactly the same. Some countries or regions may prohibit the use of clenbuterol, while others may allow its legal use. Therefore, if you have questions about the meat laws and regulations of a specific country or region, it is recommended to consult the local food safety department or relevant institutions to obtain the most accurate information.