70.30—Time and place of examination.
(a) Time and place.
The time and place of examination pursuant to the provisions of 26 U.S.C. 7602 must be such time and place as may be fixed by an appropriate TTB officer and as are reasonable under the circumstances. The date fixed for appearance shall not be less than 10 days from the date of the summons.
(b) Restrictions on examination of taxpayer.
No taxpayer is to be subjected to unnecessary examination or investigations, and only one inspection of a taxpayer's books of account shall be made for each taxable year unless the taxpayer requests otherwise or unless an authorized internal revenue or an appropriate TTB officer, after investigation, notifies the taxpayer in writing that an additional inspection is necessary.