The police had a search warrant to search my house because they suspected my friend lives there but he doesnt. What rights do I have?

Well, just based on the basic information you provided, very little.  If they had a search warrant, they can search your home to locate your friend.  If they open a closet and find drugs, you are out of luck.  If they suspect your friend to be armed or carry drugs, they can pretty much look anywhere described in the warrant.

See the warrant laws in Virginia below.  If something happened and you are now being charged for something, please contact a criminal defense attorney for a consultation.  Try www.attorneypages.com or Virginia state bar.

19.2-52. When search warrant may issue.

Except as provided in § 19.2-56.1, search warrants, based upon complaint on oath supported by an affidavit as required in § 19.2-54, may be issued by any judge, magistrate or other person having authority to issue criminal warrants, if he be satisfied from such complaint and affidavit that there is reasonable and probable cause for the issuance of such search warrant.

§ 19.2-53. What may be searched and seized.

Search warrants may be issued for the search of or for specified places, things or persons, and seizure therefrom of the following things as specified in the warrant:

(1) Weapons or other objects used in the commission of crime;

(2) Articles or things the sale or possession of which is unlawful;

(3) Stolen property or the fruits of any crime;

(4) Any object, thing, or person, including without limitation, documents, books, papers, records or body fluids, constituting evidence of the commission of crime. Notwithstanding any other provision in this chapter to the contrary, no search warrant may be issued as a substitute for a witness subpoena.

§ 19.2-56. To whom search warrant directed; what it shall command; warrant to show date and time of issuance; copy of affidavit to be part of warrant and served therewith; warrants not executed within 15 days.

The judge, magistrate or other official authorized to issue criminal warrants, shall issue a search warrant if he finds from the facts or circumstances recited in the affidavit that there is probable cause for the issuance thereof.

Every search warrant shall be directed to (i) the sheriff, sergeant, or any policeman of the county, city or town in which the place to be searched is located, (ii) any law-enforcement officer or agent employed by the Commonwealth and vested with the powers of sheriffs and police, or (iii) jointly to any such sheriff, sergeant, policeman or law-enforcement officer or agent and an agent, special agent or officer of the Federal Bureau of Investigation, the Bureau of Alcohol, Tobacco and Firearms of the United States Treasury, the United States Naval Criminal Investigative Service, the United States Department of Homeland Security, any inspector, law-enforcement official or police personnel of the United States Postal Inspection Service, or the Drug Enforcement Administration. The warrant shall (i) name the affiant, (ii) recite the offense in relation to which the search is to be made, (iii) name or describe the place to be searched, (iv) describe the property or person to be searched for, and (v) recite that the magistrate has found probable cause to believe that the property or person constitutes evidence of a crime (identified in the warrant) or tends to show that a person (named or described therein) has committed or is committing a crime.

The warrant shall command that the place be forthwith searched, either in day or night, and that the objects or persons described in the warrant, if found there, be seized. An inventory shall be produced before a court having jurisdiction of the offense in relation to which the warrant was issued as provided in § 19.2-57.

Any such warrant as provided in this section shall be executed by the policeman or other law-enforcement officer or agent into whose hands it shall come or be delivered. If the warrant is directed jointly to a sheriff, sergeant, policeman or law-enforcement officer or agent of the Commonwealth and a federal agent or officer as otherwise provided in this section, the warrant may be executed jointly or by the policeman, law-enforcement officer or agent into whose hands it is delivered. No other person may be permitted to be present during or participate in the execution of a warrant to search a place except (i) the owners and occupants of the place to be searched when permitted to be present by the officer in charge of the conduct of the search and (ii) persons designated by the officer in charge of the conduct of the search to assist or provide expertise in the conduct of the search.

Every search warrant shall contain the date and time it was issued. However, the failure of any such search warrant to contain the date and time it was issued shall not render the warrant void, provided that the date and time of issuing of said warrant is established by competent evidence.

The judge, magistrate, or other official authorized to issue criminal warrants shall attach a copy of the affidavit required by § 19.2-54, which shall become a part of the search warrant and served therewith. However, this provision shall not be applicable in any case in which the affidavit is made by means of a voice or videotape recording or where the affidavit has been sealed pursuant to § 19.2-54.

Any search warrant not executed within 15 days after issuance thereof shall be returned to, and voided by, the officer who issued such search warrant.