I have checked on line the regs. for the federal motor carrier safety administration and it seems as the cop was right. but do I fall under their guide lines if I do not drive interstate?
Yes you do. Intrastate is now treated the same as interstate, the rules are the same. If your vehicle is over 10,000 lbs and is a commercial vehicle, then you are required to have a medical card. Sorry.
If you operate a vehicle over 10,001 pounds Gross Vehicle Weight Rating (GVWR) or Gross Combination Weight Rating (GWCR) in a commercial business, then you are considered to be a motor carrier. You do not have to haul freight to be considered a motor carrier. If you are in business then you can be considered a private carrier and subject to the FMCSRs.
If you operate a vehicle that is considered a motor carrier, then you must have your company name and US DOT number displayed on both doors.
The vehicle and trailer must have a Federal inspection and both be properly tagged.
The vehicle must have all safety equipment including a fire extinguisher and safety triangles.
The driver must have a medical card. Note that a CDL license is usually not required until the GVWR or GCWR exceeds 26,000 lbs. The driver is subject to the Hours of Service regulations and must keep a logbook if traveling further than 100 air miles. The vehicle must be inspected daily and a record kept in the vehicle.
You must stop at the weigh stations.
As a motor carrier your business must register and obtain a DOT number. http://www.speedingticketcentral.com/commercial-motor-vehicle.html