Both raids were reported as ordered by Chalong Police Chief Col Ekkarat Plaiduang and conducted in Chalong and Rawai.
Acting on a search warrant, officers arrested Mr Suwan (family name not disclosed) at a rented room without number on Soi Mayuri.
The 49-year-old native of Saraburi was found in possession of 19.5g of ya ice and four rounds of .22-calibre ammunition. Police also seized what they identified as drug-taking paraphernalia, but no firearms.
Mr Suwan was taken to Chalong Police Station and charged with illegal possession of a Category 1 drug with intent to sell and illegal possession of ammunition.
In the second raid police officers searched a house on Soi Suksan 2 in Rawai, where they found Mr Yosothorn, 26; Ms Sawittree, 23; and Ms Atchareeporn, 28 (family names withheld). During the search police officers seized 65.8g of ya ice and 16,849 pills of ya bah.
All three suspects were taken to Chalong Police Station and charged with illegal possession of a Category 1 drug with intent to sell.