Is it true that even though the State of Michigan has permitted the medical use of marijuana, I could still be charged with a federal crime?
Yes, that is true. THE FEDERAL GOVERNMENT HAS NOT LEGALIZED THE USE, POSSESSION OR DISTRIBUTION OF MARIJUANA FOR ANY REASON.
As a result, if you are arrested by a Federal Agent, you can be prosecuted in Federal Court, even if you have fully complied with the Michigan Medical Marijuana Act. There is a distinct possibility that the Federal Government may raid newly licensed grow facilities or dispensaries, once they are operational. The fact that the activity is sanctioned and permitted by the State of Michigan does not prevent the Federal Government from prosecuting the activity. Make sure you are set up with an attorney who understands this distinction, and who is prepared to defend you in Federal Court, should the worst happen.