Ones in business for themselves get tested only with the occasional arrest, and even then they are back on the streets before results are back.
公娼因經常做強制性篩檢，問題較少；而不受管理、流動性高且為數眾多的私娼麻煩則較大。私娼即使在「交易現場」被逮個正著，也不過拘留幾天，臨釋放前再抽血檢驗。而往往檢驗結果還沒出來，她又已重新下海，不見蹤影了。