I don't think this is true in the US. Lawyers do not have any obligations under the Bank Secrecy Act or laws that would require this and there are other things like the text below that would make prosecuting a lawyer for this very difficult,
https://www.law.cornell.edu/uscode/text/18/1957
> (1)the term “monetary transaction” means the deposit, withdrawal, transfer, or exchange, in or affecting interstate or foreign commerce, of funds or a monetary instrument (as defined in section 1956(c)(5) of this title) by, through, or to a financial institution (as defined in section 1956 of this title), including any transaction that would be a financial transaction under section 1956(c)(4)(B) of this title, but such term *does not include any transaction necessary to preserve a person’s right to representation as guaranteed by the sixth amendment to the Constitution;*
https://www.justice.gov/jm/jm-9-105000-money-laundering
> Because the Department firmly believes that attorneys representing clients in criminal matters must not be hampered in their ability to effectively and ethically represent their clients within the bounds of the law, the Department, as a matter of policy, will not prosecute attorneys under § 1957 based upon the receipt of property constituting bona fide fees for the legitimate representation in a criminal matter, except if (1) *there is proof beyond a reasonable doubt that the attorney had actual knowledge of the illegal origin of the specific property received (prosecution is not permitted if the only proof of knowledge is evidence of willful blindness);* and (2) such evidence does not consist of (a) confidential communications made by the client preliminary to and with regard to undertaking representation in the criminal matter; or (b) confidential communications made during the course of representation in the criminal matter; or (c) other information obtained by the attorney during the course of the representation and in furtherance of the obligation to effectively represent the client.