; and (v) may not be used to circumvent any limitation or restriction on the size of the workforce of the Department. (H) Prohibition against charging certain costs to the Federal Government A private-sector organization may not charge the Department or any other agency of the Federal Government, as direct or indirect costs under a Federal contract, the costs of pay or benefits paid by the organization to an employee assigned to a Department organization under this subsection for the period of the assignment. (I) Expenses (i) In general The Secretary may pay for travel and other work-related expenses associated with individuals participating in the pilot program established under subsection (b). The Secretary shall not pay for lodging or per diem expenses for employees of a private sector organization, unless such expenses are in furtherance of work-related travel other than participating in the pilot program. (ii) Background investigation A private person supporting an individual participating in the pilot program may pay for a background investigation associated with the participation of the individual in the pilot program. (J) Maximum number of participants Not more than 250 individuals may concurrently participate in the pilot program established under subsection (b). (4) Detailing of participants With the consent of an individual participating in the pilot program established under subsection (b), the Secretary may, under the pilot program, detail the individual to another Federal department or agency. (5) Sunset The pilot program established under subsection (b) shall terminate on the date that is 7 years after the date of enactment of this Act. (6) Reports (A) Preliminary report Not later than 2 years after the date of enactment of this Act, the Secretary shall submit to the congressional homeland security committees a preliminary report describing the implementation of the pilot program established under subsection (b), including the number of participating employees from the Department and from private