Justin Tosh was last seen in Aberdeen on Thursday, January 28.
Abbie Macintosh, 16, was last seen on Friday, January 29.
More than 500 people were questioned after James Coyle went missing in November.
Kerys Lynch was last seen leaving her house in Kilwinning in North Ayrshire at around 12.30pm on Monday.
The company intends to create a pork-scented mist called Puperami that will help lure missing dogs out of hiding.
Oliver Dalton, 14, was last seen in the Denny area of Falkirk on Friday afternoon.
Chloe Brand, from Carron in Falkirk, was last seen at around 3.30pm on Friday.
Police are looking to trace Joe McGee, 32, who was released from Greenock prison last year.
Thomas Foley Smith, 29, was last seen at the Cairn Hotel in Edinburgh at around 12pm on Friday.
Merseyside Police have appealed for the public’s help to track down Jordan Goode, 17, and Obakeng Sitole, 15.
Michael Fitzpatrick, 48, was last spotted in the Haugh Street area of Falkirk at around 12pm on Friday, April 17.
A search was launched after the teen was last seen in Cruden Crescent, Aberdeen, at around 5.30pm on Friday.
Amie Choat, 13, was last seen in the Staunton Rise area of Livingston at around 8.30am on Tuesday.
Allan Smeaton, 49, was last seen in the Whitfield area of Dundee at around 3am on Saturday, March 28.
Allan Smeaton was last seen in The Cedars in Dundee at around 3am on Saturday March 28.
Allan Smeaton was last seen at Ballindean Place in Dundee at around 2:45am on Saturday March 28.
Matthew McCombe, 21, disappeared in Amsterdam during the early hours of March 14.
A search was launched after the 12-year-old disappeared from Paisley.
Jennifer Stewart and Martyna Marzec have not been seen since Tuesday.
Melita Hachey, 30, was last seen in Livingstone Place, Galashiels, last Friday afternoon.