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(4) A patient shall not be taken into custody under this section after the later of—
(a) the end of the period of six months beginning with the first day of his absence without leave; and
(b) the end of the period for which (apart from section 21 below) he is liable to be detained or subject to guardianship or, in the case of a community patient, the community treatment order is in force
The Section 3 will automatically expire and the patient cannot be retaken after the above periods; whichever is later out of (a) 6 months after the date of AWOL, or (b) the end of the current eligibility. If the patient has been abroad for over a year, the Section 3 would have lapsed. To redetain this patient, a fresh MHA Assessment would need to be conducted.