It seems to me that the salesmen receive some special training.

依我看，销售员似乎接受了一些特殊的训练。

youdao

Responsibilities and Achievements: Training and supervising 30 salesmen. Territory includes all Southern China. The turnover in the territory increased by 20% in 1993 and by 25% in 1994.

职位：区域销售经理职责与业绩：训练与督导30名推销员，范围包括整个华南区域。该区域的营业额在1993年增加了20%，在1994年增加了25%。

youdao

Position: Area sales Manager Responsibilities and Achievements: Training and supervising 30 salesmen. Territory includes all Southern China.

职位：区域销售经理职责与业绩：训练与督导30名推销员，范围包括整个华南区域。

youdao

And the MicroDrip salesmen need training, which Joel provides.

FORBES: Capitalist Do-Gooders Vs. Poverty - Warts And All

In a training video to potential salesmen in India, McCormick can clearly be heard saying he "worked with explosives" during his time with the British police.

CNN: Fake bomb detector maker made millions from trick