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http://www.state.gov/m/ds/clearances/c10977.htm

http://www.state.gov/m/ds/clearances/26912.htm#2
Foreign Influence

The Concern. A security risk may exist when an individual's immediate family, including cohabitants, and other persons to whom he or she may be bound by affection, influence, or obligation are not citizens of the United States or may be subject to duress. These situations could create the potential for foreign influence that could result in the compromise of classified information. Contacts with citizens of other countries or financial interests in other countries are also relevant to security determinations if they make an individual potentially vulnerable to coercion, exploitation, or pressure.

Conditions that could raise a security concern and may be disqualifying include:

1. An immediate family member, or a person to whom the individual has close ties of affection or obligation, is a citizen of, or resident or present in, a foreign country;

2. Sharing living quarters with a person or persons, regardless of their citizenship status, if the potential for adverse foreign influence or duress exists;

3. Relatives, cohabitants, or associates who are connected with any foreign government;

4. Failing to report, where required, associations with foreign nationals;

5. Unauthorized association with a suspected or known collaborator or employee of a foreign intelligence service;

6. Conduct which may make the individual vulnerable to coercion, exploitation, or pressure by a foreign government;

7. Indications that representatives or nationals from a foreign country are acting to increase the vulnerability of the individual to possible future exploitation, coercion or pressure;

8. A substantial financial interest in a country, or in any foreign owned or operated business that could make the individual vulnerable to foreign influence.

Foreign Preference

The Concern. When an individual acts in such a way as to indicate a preference for a foreign country over the United States, then he or she may be prone to provide information or make decisions that are harmful to the interests of the United States.

Conditions that could raise a security concern and may be disqualifying include:

1. The exercise of dual citizenship;

2. Possession and/or use of a foreign passport;

3. Military service or a willingness to bear arms for a foreign country;

4. Accepting educational, medical, or other benefits, such as retirement and social welfare, from a foreign country;

5. Residence in a foreign country to meet citizenship requirements;

6. Using foreign citizenship to protect financial or business interests in another country;

7. Seeking or holding political office in the foreign country;

8. Voting in foreign elections; and

9. Performing or attempting to perform duties, or otherwise acting, so as to serve the interests of another government in preference to the interests of the United States.

http://www.securityclearances.org/legal-articles-index.asp

I’m concerned that studying abroad will affect the security clearance process; do you have any tips? While study abroad can affect the security clearance process, we recommend that you keep a journal of your interactions and activities while overseas that can be passed on to a security clearance administrator/agent/person. It may seem tedious but this information may expedite the security clearance process and provide you with you an opportunity to keep track of your experience.