must be confirm vs must be confirmed

Some examples from the web:

• Test samples giving intermediate absorbance values are doubtful and a second technique must be employed to confirm the result.
• If disposable filter cartridges are used each lot must be checked to confirm that it does not release soluble organic carbon.
• Test samples giving intermediate absorbance values are considered to be inconclusive and a second technique must be employed to confirm the result.
• The disease has no particular clinical features that clearly distinguish it from other types of pneumonia, and laboratory investigations must be carried out to confirm the diagnosis.
• But it must be clear that Parliament confirms its commitment to the ad hoc procedure - by way of derogation from Article 14 of the Financial Regulation - which should take account of Parliament's requests, irrespective of the category of the expenditure.
• Groundskeepers confirm there are no other keys.
• General Leone has communicated with the Command and confirms...
• That confirms our target landed in this waste receptacle.
• You need an open-lung biopsy to confirm pulmonary fibrosis.
• It confirms my already high opinion of her parliamentary talents.
• Computer confirms door malfunction in storage area four.
• These findings confirm the results of earlier FVO missions.
• The microeconomic evidence confirms the macroeconomic trends.
• He confirms someone accessed one of his accounts.
• Get a dural biopsy to confirm brain cancer.
• This confirms that there are many differences within our Union.
• Confirms the car was in both places.
• Blood tests alone can't confirm aplastic anemia.
• Your diagnosis could confirm Kalvin's.
• Confirm if you are in Chilian soil.

Some examples from the web:

• The diagnosis must be confirmed by appropriate genetic testing.
• This provision must be confirmed and complemented by the Commission in accordance with Article 7.
• The 6- and 12-mile limits must be confirmed permanently.
• The concentrations/rates of application must be confirmed by an appropriate analytical verification.
• The contract must be confirmed by one or more tickets issued to the passenger.
• It must be confirmed that the monograph and safety file has have been adapted to include all new information relevant to the additive or now required as a result of changes in these guidelines.
• The specificity of any CPE must be confirmed.
• Reservations must be confirmed 24 hours in advance.
• It must be confirmed by other scientists.
• Such decision shall be provisional and must be confirmed or revoked by the Commission once the examination provided for in paragraph 2 has taken place.
• the fact that the specification of the technical material as commercially manufactured must be confirmed and supported by appropriate analytical data.
• Where appropriate and in particular in the case of cans and glass jars, the integrity of the container's construction and its cleanliness must be confirmed before filling.
• We are convinced that space is a key sector for Europe and that this decision, formalised by the establishment of the European Space Agency, must be confirmed and consolidated.
• For all substances, if challenged on the basis of a contradictory analysis, those results must be confirmed by the national reference laboratory designated in accordance with Article 14 (1) for the substance or residue in question.
• A positive first screening test (IF test, PCR/FISH, selective isolation) must be confirmed by a second screening test based on a different biological principle.
• 2. For Group A substances, all positive findings recorded following the application of a routine method instead of a reference method must be confirmed by an approved laboratory using the reference methods laid down in accordance with paragraph 1.
• Where no decision has been taken on the staff member by the end of two months, from the date on which the decision that the staff member be suspended came into force, the continuation of that suspension must be confirmed by the Executive Board.
• the specification of the technical material as commercially manufactured must be confirmed and supported by appropriate analytical test material used in the toxicity dossiers should be compared and verified against this specification of the technical material,
• the results of calibration and verification, whereby, for computer software used in the monitoring and measurement of specified requirements, the ability of the software to perform the desired task must be confirmed prior to initial use and reconfirmed as necessary;
• It must be confirmed that further scientific knowledge in the available literature on the additive has not changed the original assessment on efficacy since the authorisation for putting into circulation of the original additive.