There is much speculation as to the significance of the search of the offices and hotel room of President Trump Donald John TrumpBubba Wallace to be driver of Michael Jordan, Denny Hamlin NASCAR team Graham: GOP will confirm Trump's Supreme Court nominee before the election Southwest Airlines, unions call for six-month extension of government aid MORE’s lawyer, Michael Cohen. To obtain a search warrant, prosecutors must demonstrate to a judge that they have probable cause to believe that the premises to be searched contain evidence of crime. They must also specify the area to be searched, the items to be seized and, in searches of computers, the word searches to be used.

At least that’s the constitutional requirement in theory, especially where the Sixth Amendment right to counsel is involved, in addition to the general Fourth Amendment right against unreasonable searches. Yet, in practice, judges often give the FBI considerable latitude, relying on the “firewalls” and “taint teams” they set up to protect the subject of the search from violation of his or her constitutional rights.

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But the firewalls and taint teams are comprised of government agents who themselves may not be entitled to read or review many of the items seized. It is an imperfect protection of important constitutional rights. That’s why Justice Department officials must be careful to limit the searching of lawyers’ offices to compelling cases involving serious crimes. We don’t know at this point what the prosecutors are looking for but, if it relates to payments made to porn star Stormy Daniels, that would not seem to justify so potentially intrusive a search of Cohen’s confidential lawyer-client files.

There are, of course, exceptions to the lawyer-client privilege. First, the lawyer must be acting as a lawyer, not as a friend or business associate. But the scope of a lawyer’s work is quite broad, encompassing much more than merely giving legal advice. It includes settling cases by making payments to potential litigants. Second, the lawyer must be engaged in lawful activities on behalf of the clients. Illegal or fraudulent activities are not covered by the privilege. Nor are communications with third persons, such as the lawyer for the other side, though such communications may be covered by the much weaker “settlement privilege.”

Civil libertarians should be concerned whenever the government interferes with the lawyer-client relationship. Clients should be able to rely on confidentiality when they disclose their most intimate secrets in an effort to secure their legal rights. A highly publicized raid on the president’s lawyer will surely shake the confidence of many clients in promises of confidentiality by their lawyers. They will not necessarily understand the nuances of the confidentiality rules and their exceptions. They will see a lawyer’s office being raided and all his files seized.

I believe we would have been hearing more from civil libertarians — the American Civil Liberties Union, attorney groups and privacy advocates — if the raid had been on Hillary Clinton Hillary Diane Rodham ClintonJoe Biden looks to expand election battleground into Trump country Biden leads Trump by 12 points among Catholic voters: poll The Hill's Campaign Report: Biden goes on offense MORE’s lawyer. Many civil libertarians have remained silent about potential violations of President Trump’s rights because they strongly disapprove of him and his policies. That is a serious mistake, because these violations establish precedents that lie around like loaded guns capable of being aimed at other targets.

I have been widely attacked for defending the constitutional rights of a president I voted against. In our hyperpartisan age, everyone is expected to choose a side, either for or against Trump. But the essence of civil liberties is that they must be equally applicable to all. The silence among most civil libertarians regarding the recent raid shows that we are losing that valuable neutrality.

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MORE BY ALAN DERSHOWITZ

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What else does the raid tell us? It seems likely that special counsel Robert Mueller Robert (Bob) MuellerCNN's Toobin warns McCabe is in 'perilous condition' with emboldened Trump CNN anchor rips Trump over Stone while evoking Clinton-Lynch tarmac meeting The Hill's 12:30 Report: New Hampshire fallout MORE is bifurcating the investigation: He will keep control over matters relating to Russia, the campaign and any possible obstruction. But he has handed over to the U.S. attorney for the Southern District of New York any matters relating to Trump’s personal and business affairs. Mueller will work hand in hand with the New York prosecutors, but they will be in charge of the other matters. If they manage to find prosecutable evidence against Trump’s lawyer, they may try to squeeze him into cooperating against his client.

It is doubtful that Cohen would cooperate, even if he has anything on his client. But prosecutors often try to get lawyers to “sing” against their clients — to become “canaries” — in order to save their own feathers. Some flipped witnesses will tell prosecutors anything they want to hear in order to earn a “get out of jail free card.” They know that the “better” their story, the more leniency they will earn. So, in addition to singing, they “compose” by making up incriminating details.

I have seen this on many occasions. Mueller has already apparently flipped several witnesses, but Cohen would be his biggest catch in the unlikely event he could be induced to turn against his client. So, stay tuned to this unfolding drama, but remember that prosecutorial tactics used today against President Trump may tomorrow be used against Democrats — and even against you.

Alan M. Dershowitz is the Felix Frankfurter Professor of Law, Emeritus, at Harvard Law School. He is the author of “Trumped Up: How Criminalizing Politics is Dangerous to Democracy” and “The Case Against BDS: Why Singling Out Israel for Boycott is Anti-Semitic and Anti-Peace.” You can follow him on Twitter @AlanDersh and on Facebook @AlanMDershowitz.