All the domestic materials of medicines sent from various districts to the cities where the agency was set up, as well as those sent to other districts passing through the cities, were obligated to receive a seal of approval (a brand or paper tag) after being inspected at kaisho for their genuineness and quality (if the amount of the materials was large, visiting inspection was performed by officials of the kaisho.)
諸国から設置都市に送られてきた和薬種及び都市を通過して他の地域に向かう薬種は全て会所にて検査を受けて薬種の真偽及びその品質を検査した後に検印（焼印もしくは紙札）を得ることが義務付けられた（対象となる薬種が大量の場合は、会所役人が出張して検査した）。