We know that 'lack of Synthroid' is NOT the cause of any thyroid problem. Exposure to chemicals, e.g. perchlorate, common food intolerances (e.g. wheat/dairy), adrenal fatigue and nutrient deficiencies are the cause of 'hypothyroidism' in the vast majority of cases.
An F3 felony is a shorthand expression for a class or category 3 (or III) felony in jurisdictions that use numbered offense categories. What such an offense is punishable by and whether it is punishable by more or less than an F2 felony depends completely on the laws of the jurisdiction in question.
Felony crimes are serious crimes that include burglary and murder. Class 1 is the most serious classification, which can result in a minimum life sentence in prison, and a maximum penalty of death. Class 2 felonies can result in life imprisonment, or a minimum of 20 years imprisonment. Class 3 felonies can result in imprisonment of 5-20 years. Class 4 felonies can result in imprisonment of 2-10 years. Class 5 felonies can result in imprisonment of up to 1-10 years in prison, or jail of up to 12 months. A Class 6 felony can result in a minimum prison sentence of one year. Minimum sentences are part of the U.S. Penal code, but each state can impose additional imprisonment, fines or both.