WASHINGTON (AP) _ FBI Director Louis Freeh and his senior deputies will take lie-detector tests as part of stepped-up security procedures following the arrest of a veteran FBI agent charged with spying for Moscow over a period of 15 years.

``The director always includes himself in whatever policy applies to FBI employees,'' John Collingwood, an FBI spokesman, said Friday. ``He will exercise the same leadership in regard to the expansion of the polygraph policy.''

The FBI would not say when Freeh would be taking the test.

About 500 FBI employees with access to confidential data, from assistant directors to clerks, began taking lie-detector tests late last month, a security response to a veteran agent's arrest on espionage charges.

In the past, lie-detector tests were given to agents as part of their application to the bureau and to agents involved in sensitive assignments. The new policy, described as an interim step as security procedures are being reviewed, expands the number of employees who must be polygraphed.

The change follows the Feb. 18 arrest of Robert Philip Hanssen, charged with spying for Moscow while working in highly sensitive counterintelligence jobs. The FBI has been criticized for failing to give Hanssen a polygraph in his 25-year career.

Some polygraph experts and former FBI agents oppose expanding the use of polygraphs, saying the test is not totally reliable and can turn up false readings that have a negative effect on agents' careers.

In a memo to all employees last month, Freeh said, ``I recognize that many employees will approach a polygraph with some degree of concern despite being of the highest moral character and demonstrating exemplary performance.

``Together, we will strike the proper balance between security, operations and employee privacy,'' Freeh wrote.

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