1002 Provisos . Existence of doc u- mentary evidence . Additions requited to school, etc ., record of age . Ce rtifi cate of s choo l medical inspector . Affidav it of parent , etc. Birth certificate ac- cepted as preferred proof. Others, if such cannot be obta ined . Effect, if preferred proof obtained . Vacation permits . Authority for issue thereof. Difference in color, etc. Em ploy er re ceiv ing permit to give notice of employment and ter- mination . Effect of failure, etc. Evidence required of employer that minor with out permit has reached 18. SEVENTIETH CONGRESS . SEss . I. CH. 908 . 1928 . a certificate of arrival in the United States issued by the United States immigration officers and showing the age of the child, or a life-insurance policy : Provided, That such other satisfactory docu- mentary evidence has been in existence at least one year prior to the time it is offered in evidence : And provided further, That a school re cord or a parent's , guardia n's, or c ustodian 's affida vit, cert ificate, or other written statement of age shall not be accepted except as specified in paragraph (d) . (d) A certificate of physical age, signed by a medical inspector of the public schools assigned by the board of health for such pur- poses and based upon a physical examination, which shall state the height and weight of such minor and other evidence upon which the opinion as to the age of such minor is founded . A parent's, gu ardian 's, or custo dian's affid avit o f age, and a record of th e age as given in the register of the school first attended by the minor, if ob tainab le, or in th e earl iest a vailab le scho ol cen sus, s hall a ccom- pa ny the physi cian's certi ficate of ag e . And no work or vaca tion permit shall be issued if any of the above possible sources shows the minor to be under the age of fourteen . The proof of age specified in subdivision (a) shall be accepted in preference to that specified in any subsequent subdivision, and no proof of age permitted by any subsequent subdivision shall be accepted unless there be received and filed substantial evidence that the proof required by the preceding subdivisions can not be obtained . Should such preferred proof of age be later procured, or if subse- quent proof of age shall be procured and shall conclusively establish the falsity of the proof previously accepted, the director of the department of school attendance and work permits shall cancel the permit and issue or refuse a new one according to the age thus es tablished . SEC . 12. The director of the department of school attendance and work permits, or any person duly authorized by him, shall have authority to issue a vacation permit to a minor between the age of fourteen and sixteen years, permitting employment during the regu- lar summer vacation period of the public schools, or during the school term at such time as the public schools are not in session, if the age of such minor has been proved according to section 11 of this Act, and such minor has in all other respects, except as to completion of the eighth grade, fulfilled the requirements for a work permit specified in this Act . These permits shall be different in color from the work permit allowing employment while school is in session and shall state the periods during which its use is valid . SEC . 13 . Every employer receiving a work or vacation permit shall notify the department in writing within three days of the time of the commencement of the employment of such minor, and within three days after termination of the employment shall return said permit to the department . Failure to so notify shall be cause for the cancellation of the permit ; and failure to so return it shall be cause for the refusal of further permits upon the application of such employer . Returned permits shall be filed and the proper school au thorities notified . A new cer tific ate s hall not be is sued to a ny minor except upon presentation of a new promise of employment and a new certificate of physical fitness . SEC . 14 . Whenever any person authorized to enforce this Act shall have reason to doubt that any minor employed in any occupation for which a permit is required by this Act, and for whom a work permit or vacation permit is not on file, has reached the age of eigh teen years, such per son may make demand on such minor's employer that such employer shall either furnish him within ten days the evidence required for a work permit showing that the minor
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