Please answer the following question: Given the following passage  "In the 2010s, American jurisdictions have experienced a shortage of lethal injection drugs, due to anti-death penalty advocacy and low production volume. Hospira, the only U.S. manufacturer of sodium thiopental, stopped making the drug in 2011. The European Union has outlawed the export of any product that could be used in an execution; this has prevented executioners from using EU-manufactured anesthetics like propofol which are needed for general medical purposes. Another alternative, pentobarbital, is also only manufactured in the European Union, which has caused the Danish producer to restrict distribution to U.S. government customers.",  answer the following question. Note that the answer is present within the text.  Question: Why are American governments having trouble getting drugs to carry out executions
A:
The European Union has outlawed the export of any product that could be used in an execution