Depending on their performance, MEMS accelerometers may be embraced by the U.S. Munitions List (USML). If so, a U.S. person should take care not to commit a deemed export violation by even disclosing certain types of information respecting their design and manufacture to a non U.S. person...much less exporting them...without the proper license from the Dept. of Defense Trade Controls, U.S. Dept of State. Can you tell I've been up-to-my-ears in understanding the export licensing of accelerometers and devices that include them (i.e., inertial measurement units, inertial navigation systems, etc.).
Yeah, I had that problem some years ago with an IR photodiode made by a US company. Solved it by buying a better part made by a foreign company which unfortunately sent that business off shore. Somethimes the rules don't seem to make sense in the big picture.
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The hardest thing to overcome, is not knowing that you don't know.
No, the rules really don't make sense when you take into account all the competing interests of the U.S. governing agencies. Our government is so ponderously large and our laws are so intractably complex that they can't all be reconciled.