If a policeman tapped me on the shoulder to land my toy plane because of a NOTAM, I would not like it but I would no doubt comply. This scenario is a far cry from expecting me to keep in constant contact with the latest, up to the minute issuances of NOTAMS.
Any cop with a triple digit IQ ought to feel pretty silly about telling guys who are out flying over a 20 acre field to cease and desist or else face arrest.
If the AMA and it's members held a unified stance about shunning drone style flight at AMA fields, we would have much firmer ground to stand upon in the eyes of the law.
The AMA field should be a sanctuary for RC flyers to be able to enjoy this hobby whether there are NOTAMS or not.